IS-IS Flex-Algorithm Configuration¶
Overview¶
The IS-IS algorithm historically calculates paths on the network using the SPF algorithm based on the best total shortest link metric (aka the IGP metric) to the destination. The paths are calculated automatically but may not be optimal for all the use cases. Traffic Engineering protocols such as RSVP-TE provide a solution for steering traffic along defined paths. However, they require manual path configurations that, in addition to being complex to maintain, do not allow the paths to be moved dynamically when the network conditions change.
Flex-Algorithm allows new algorithms to run in parallel with the historical algorithm to compute paths based on new constraints dynamically. A Flexible-Algorithm can restrict paths to links from the specific affinities or avoid links from the specific affinities. The metric can use some TE values such as the metric and the delay instead of the IGP metric. Combinations of these constraints are possible.
Up to 128 Flex-Algorithms can co-exist in an IS-IS area. Each one has a numeric identifier and shares the following definitions:
the metric type (the default link, TE or, delay metric)
the calculation type (the Flex-Algorithm standard only defines the SPF one for the moment but more types will probably be standardized in the future),
a set of link constraints to include or exclude a certain given set of links,
the prefix-metric flag.
Configuration of a Flex-Algorithm¶
The requirements to enable a given Flex-Algorithm on all IS-IS routers whose participation in the algorithm is desired are the following:
enabling the SR MPLS dataplane,
enabling the SR MPLS dataplane for the selected Flex-Algorithm numeric ID,
configuring a Node prefix-SID for the selected Flex-Algorithm,
configuring and enabling the advertisement of the Flex-Algorithm Definition on a subset of the routers (on a minimum of two for redundancy).
This section describes how to configure a particular Flex-Algorithm with
an include-any link constraint. The include-any constraint means that the
computed paths must only use the links a given affinity.
Segment Routing basic configuration¶
This section describes the SR basic configuration step that is necessary before configuring IS-IS Flex-Algorithm.
The below drawing shows an IS-IS SR topology of nine routers, named from
rt0 to rt9. Each rtX router has a loopback IP address in the format
X.X.X.X, except rt0 which has the 10.10.10.10 IP address. Each loopback has
an MPLS prefix SID in the format 2000X.
IS-IS segment routing topology¶
SR is configured on rt0. Other router configurations are similar.
rt0
rt0 running config# vrf main
rt0 running vrf main# interface physical eth-rt1
rt0 running physical eth0#! ipv4 address 10.1.0.10/24
rt0 running physical eth0#! port pci-b0s4
rt0 running physical eth0# .. ..
rt0 running vrf main# interface physical eth-rt5
rt0 running physical eth0#! ipv4 address 10.5.0.10/24
rt0 running physical eth0#! port pci-b0s5
rt0 running physical eth0# .. ..
rt0 running vrf main# interface loopback loop1
rt0 running loopback loop1# ipv4 address 10.10.10.10/32
rt0 running loopback loop1# .. ..
rt0 running vrf main# routing interface loop1
rt0 running interface loop1# isis area-tag 1
rt0 running interface loop1#! isis ipv4-routing true
rt0 running interface loop1# .. ..
rt0 running vrf main# routing interface eth-rt1
rt0 running interface eth-rt1# isis area-tag 1
rt0 running interface eth-rt1#! isis ipv4-routing true
rt0 running interface eth-rt1# isis network-point-to-point true
rt0 running interface eth-rt1# .. ..
rt0 running vrf main# routing interface eth-rt5
rt0 running interface eth-rt5# isis area-tag 1
rt0 running interface eth-rt5#! isis ipv4-routing true
rt0 running interface eth-rt5# isis network-point-to-point true
rt0 running interface eth-rt5# .. ..
rt0 running vrf main# routing isis instance 1
rt0 running instance 1# area-address 49.0000.0000.0000.1000.00
rt0 running instance 1# is-type level-1
rt0 running instance 1# segment-routing enabled true
rt0 running instance 1# segment-routing msd node-msd 8
rt0 running instance 1# segment-routing label-blocks srgb lower-bound 20000 upper-bound 23000
rt0 running instance 1# segment-routing prefix-sid-map 10.10.10.10/32 sid-value 0
The metrics have been left at the default value. The routes from rt0 and rt9
uses multiple paths:
rt0> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 40, best
Last update 00:00:04 ago
* 10.5.0.5, via eth-rt5, label 20009, weight 1
rt1> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 40, best
Last update 00:00:18 ago
* 10.12.0.2, via eth-rt2, label 20009, weight 1
* 10.14.0.4, via eth-rt4, label 20009, weight 1
* 10.15.0.5, via eth-rt5, label 20009, weight 1
rt2> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 30, best
Last update 00:00:09 ago
* 10.23.0.3, via eth-rt3, label 20009, weight 1
* 10.26.0.6, via eth-rt6, label 20009, weight 1
rt3> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 20, best
Last update 00:00:09 ago
* 10.39.0.9, via eth-rt9, label implicit-null, weight 1
rt4> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 30, best
Last update 00:00:12 ago
* 10.34.0.3, via eth-rt3, label 20009, weight 1
rt5> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 30, best
Last update 00:00:11 ago
* 10.56.0.6, via eth-rt6, label 20009, weight 1
rt6> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 20, best
Last update 00:00:13 ago
* 10.69.0.9, via eth-rt9, label implicit-null, weight 1
rt7> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 20, best
Last update 00:00:12 ago
* 10.79.0.9, via eth-rt9, label implicit-null, weight 1
rt8> show ipv4-routes to 9.9.9.9
Routing entry for 9.9.9.9/32
Known via "isis", distance 115, metric 30, best
Last update 00:00:14 ago
* 10.78.0.7, via eth-rt7, label 20009, weight 1
Routes to rt9 follow the arrows.¶
See also
Refer to the Segment Routing chapter for details.
Flex algorithm configuration¶
The Flex-Algorithm 130 is going to be configured with the following specifications:
The Flex-Algorithm 130 is enabled on all routers, except
rt4.The Flex-Algorithm Definition is advertised from
rt0andrt9with the following characteristics:Algorithm ID: 130
Metric type: IGP (default value)
Include-Any link constraint: affinity blue - bit position 0
Priority of the definition: 128 (default value)
The link affinity blue is set between:
rt0andrt1rt1andrt2rt2andrt3rt3andrt9rt0andrt5rt5andrt6rt6andrt7rt7andrt9
Desired topology for Flex-Algorithm 130¶
Setting affinity on links¶
TE link attributes like the affinity for the Flex-Algorithm application are advertised in LSPs:
in the neighbor section of “IS Extended Reachability” TLV,
sub-TLV “Application Specific Link-Attribute”
sub-sub-TLV “Extended Admin-Group”
Enable globally the advertising of TE in LSPs for IS-IS instance:
rt0 to rt9
rt0 running config# / vrf main routing isis instance 1 traffic-engineering
An affinity refers to a color or a ressource class in the TE terminology.
The affinity name is a shorthand to refer to the setting of a particular bit
with the admin-group. The bit position means the position of the bit set
starting from the least significant bit. In this example, the affinity blue
has bit position 0 so the admin-group value is 0x01. If the affinity red bit
position 2 was added to a link in combination with the blue affinity, the
admin-group value would be 0x05.
An affinity-map allows associating a affinity name with an admin-group bit
position.
Add the blue affinity definition on all the routers.
rt0 to rt9
rt0 running config# / routing traffic-engineering affinity-map blue bit-position 0
Then set the blue affinity on the desired links.
rt0 running config# / vrf main routing interface eth-rt1 traffic-engineering affinity-map blue
Setting point-to-point mode on link¶
The Flex-Algorithm implementation relies on the implementation of specific
TE RFCs: RFC 5305 and RFC 8570. Those RFCs standardize the
encoding of TE link attributes in the “Extended IS Reachability” TLV.
Even though not explicitly said in the RFCs, some link attributes like
the unidirectional link delay do not make sense when the IS-IS links are of
point-to-multipoint mode. Because of that, the link attributes are only
advertised when the links are set to the point-to-point mode.
rt0 and similarly for all other routers
rt0 running config# / vrf main routing interface eth-rt1 isis network-point-to-point true
rt0 running config# / vrf main routing interface eth-rt5 isis network-point-to-point true
Enabling the Flex-Algorithm 130¶
Configure the SR MPLS dataplane for the Flex-Algorithm 130.
rt0 to rt9 except rt4
rt0 running config# / vrf main routing isis instance 1
rt0 running instance 1# flex-algorithm 130
rt0 running flex-algorithm 130# dataplane sr-mpls
Setting the nodes prefix-SIDs for the Flex-Algorithm 130¶
The node prefix SIDs are set in the format 2030X on all routers except
rt4 which does not participate in the Flex-Algorithm.
rt0
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 130
rt0 running flex-algorithm 130# segment-routing prefix-sid-map 10.10.10.10/32 sid-value 300
rt1 and similarly for all other routers
rt1 running config# / vrf main routing isis instance 1 flex-algorithm 130
rt1 running flex-algorithm 130# segment-routing prefix-sid-map 10.10.10.10/32 sid-value 301
The rt0 node prefix SID value is 20300, which is the sum of SR global
block lower-bound value 20000 plus the sid-value of 300.
Advertise the Flex-Algorithm 130 definition¶
No router participates in the Flex-Algorithm 130 for the moment because no Flex-Algorithm Defintion (FAD) provides the Flex-Algorithm specifications.
Configure the FAD advertisement on a subset of the routers and the other routers will automatically use it. To guarantee that all the area routers use the same set of FADs, each router runs a FAD election process to select the winning FAD for each locally enabled Flex-Algorithm using the following rules:
If a locally configured FAD is not advertised to the area, the router does not participate in the particular flex algorithm.
If a given flex algorithm is running, the participation in this particular flex algorithm stops when its advertisements are over.
A router includes its own FAD in the election process if and only if it is configured to be advertised to the other routers.
If only one router advertises the FAD, the FAD is elected.
If several FADs are advertised with different priorities, the one with the highest priority value is selected.
If there are multiple advertisements of the FAD with the same highest priority, the FAD of the router with the highest IS-IS system-ID is selected.
Routers always use the specifications of the winning FAD regardless of the locally configured definitions.
The FADs are advertised within the FAD sub-TLV of the “Router Capability” TLV. A router announces that it participates in a particular SR Flex-Algorithm by adding the Flex-Algorithm numeric identifier to the list of algorithms in the SR algorithm sub-TLV of the “Router Capability” TLV.
Warning
The proper functioning of a Flex-Algorithm relies on its FAD advertisement. If a router stops receiving the FAD (upon invalidation of the LSPs that carry it), it will cease to participate in the particular Flex-Algorithm. The location within the area of the advertising routers is then strategic and should be carefully chosen. Make sure that isolating a small set of the area can not impact the complement set.
Changing the specifications of a FAD in production causes a traffic disruption. Instead, we recommend creating a new Flex-Algorithm topology and then switching to it when ready. Applying the new definition causes a path recomputation on the whole Flex-Algorithm topology. Furthermore, if some routers received a definition type that they do not support, they would stop participating in the Flex-Algorithm according to the Flex-Algorithm standard. Note that most router vendors do not support all the definition types of Flex-Algorithm. Virtual Service Router may advertise a feature that is not supported by another router. Note that the exclude SRLG constraint is not supported for the moment by Virtual Service Router.
Advertise the FAD from rt0 and rt9 only:
rt0 and rt9
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 130
rt0 running flex-algorithm 130# definition advertise true
rt0 running flex-algorithm 130# definition affinity include-any blue
Displaying Flex-Algorithm information¶
State of Flex-Algorithms¶
Show the enabled Flex-Algorithm and its definition.
rt0> show isis flex-algorithm
Area 1: Algorithm 130
Enabled Data-Planes: SR-MPLS
Elected and running Flexible-Algorithm Definition:
Source: 0000.0000.1009
Priority: 128
Equal to local: yes
Local state: enabled
Calculation type: spf
Metric type: igp
Prefix-metric: disabled
Exclude SRLG: disabled
Exclude-any admin-group: not-set
Include-all admin-group: not-set
Include-any admin-group: 0x00000001
Bit positions: 0
Nodes participating in a given Flex-Algorithm¶
Show the participating SR nodes in Flex-Algorithm 130. rt4 is absent as
expected.
rt0> show isis segment-routing node flex-algorithm 130
Area 1:
IS-IS L1 SR-Nodes:
System ID SRGB SRLB Algorithm MSD
------------------------------------------------------------------
0000.0000.1000 20000 - 23999 15000 - 15999 Flex-Algo 130 8
0000.0000.1001 20000 - 23999 15000 - 15999 Flex-Algo 130 8
0000.0000.1002 20000 - 23999 15000 - 15999 Flex-Algo 130 8
0000.0000.1003 20000 - 23999 15000 - 15999 Flex-Algo 130 8
0000.0000.1005 20000 - 23999 15000 - 15999 Flex-Algo 130 8
0000.0000.1006 20000 - 23999 15000 - 15999 Flex-Algo 130 8
0000.0000.1007 20000 - 23999 15000 - 15999 Flex-Algo 130 8
0000.0000.1008 20000 - 23999 15000 - 15999 Flex-Algo 130 8
0000.0000.1009 20000 - 23999 15000 - 15999 Flex-Algo 130 8
IS-IS L2 SR-Nodes:
Flex-Algorithm information in the LSP database¶
Show the Flex-Algorithm information from the LSP database.
rt0> show isis database detail
(...)
rt9.00-00 213 0x00000005 0xd6cd 1090 0/0/0
Protocols Supported: IPv4
Area Address: 49.0000
Hostname: rt9
TE Router ID: 10.255.9.1
Router Capability: 10.255.9.1 , D:0, S:0
Segment Routing: I:1 V:1, Global Block Base: 20000 Range: 4000
SR Local Block Base: 15000 Range: 1000
SR Algorithm:
0: SPF
130: Flex-Algo
Node Maximum SID Depth: 8
Flex-Algo Definition: 130
Metric-Type: 0
Calc-Type: 0
Priority: 128
Exclude-Any: not-set
Include-Any: 0x00000001
Include-All: not-set
M-Flag: 0
Extended Reachability: 0000.0000.1003.00 (Metric: 10)
Adjacency-SID: 15000, Weight: 0, Flags: F:0 B:0, V:1, L:1, S:0, P:0
Application Specific Link Attributes:
L flag: 0, SA-Length: 1, UDA-Length: 1
Standard Applications: 0x10 Flex-Algo
User Defined Applications: 0x10
Ext Admin Group: 0x00000001
Bit positions: 0
Extended Reachability: 0000.0000.1007.00 (Metric: 10)
Adjacency-SID: 15001, Weight: 0, Flags: F:0 B:0, V:1, L:1, S:0, P:0
Application Specific Link Attributes:
L flag: 0, SA-Length: 1, UDA-Length: 1
Standard Applications: 0x10 Flex-Algo
User Defined Applications: 0x10
Ext Admin Group: 0x00000001
Bit positions: 0
IPv4 Interface Address: 10.255.9.1
Extended IP Reachability: 10.39.0.0/24 (Metric: 10)
Extended IP Reachability: 10.79.0.0/24 (Metric: 10)
Extended IP Reachability: 9.9.9.9/32 (Metric: 10)
Subtlvs:
SR Prefix-SID Index: 9, Algorithm: 0, Flags: NODE PHP
SR Prefix-SID Index: 309, Algorithm: 130, Flags: NODE PHP
Prefix attribute flags: 0x20 Node (N): 1
IS-IS topology information for a given Flex-Algorithm¶
Show the IS-IS topology for Flex-Algorithm 130. rt4 and rt8 do not
appear in the topology. rt4 does not participate in Flex-Algorithm 130 and
rt8 has no blue affinity on links.
rt0> show isis topology flex-algorithm 130
Area 1: Algorithm 130
IS-IS paths to level-1 routers that speak IP
Vertex Type Metric Next-Hop Interface Parent
rt0
10.1.0.0/24 IP internal 0 rt0(4)
10.5.0.0/24 IP internal 0 rt0(4)
10.10.10.10/32 IP internal 0 rt0(4)
rt1 TE-IS 10 rt1 eth-rt1 rt0(4)
rt5 TE-IS 10 rt5 eth-rt5 rt0(4)
rt2 TE-IS 20 rt1 eth-rt1 rt1(4)
rt6 TE-IS 20 rt5 eth-rt5 rt5(4)
10.1.0.0/24 IP TE 20 rt1 eth-rt1 rt1(4)
10.12.0.0/24 IP TE 20 rt1 eth-rt1 rt1(4)
10.14.0.0/24 IP TE 20 rt1 eth-rt1 rt1(4)
10.15.0.0/24 IP TE 20 rt1 eth-rt1 rt1(4)
rt5 eth-rt5 rt5(4)
1.1.1.1/32 IP TE 20 rt1 eth-rt1 rt1(4)
10.5.0.0/24 IP TE 20 rt5 eth-rt5 rt5(4)
10.56.0.0/24 IP TE 20 rt5 eth-rt5 rt5(4)
10.58.0.0/24 IP TE 20 rt5 eth-rt5 rt5(4)
5.5.5.5/32 IP TE 20 rt5 eth-rt5 rt5(4)
rt3 TE-IS 30 rt1 eth-rt1 rt2(4)
rt7 TE-IS 30 rt5 eth-rt5 rt6(4)
10.23.0.0/24 IP TE 30 rt1 eth-rt1 rt2(4)
10.26.0.0/24 IP TE 30 rt1 eth-rt1 rt2(4)
rt5 eth-rt5 rt6(4)
2.2.2.2/32 IP TE 30 rt1 eth-rt1 rt2(4)
10.67.0.0/24 IP TE 30 rt5 eth-rt5 rt6(4)
6.6.6.6/32 IP TE 30 rt5 eth-rt5 rt6(4)
rt9 TE-IS 40 rt1 eth-rt1 rt3(4)
rt5 eth-rt5 rt7(4)
10.34.0.0/24 IP TE 40 rt1 eth-rt1 rt3(4)
10.37.0.0/24 IP TE 40 rt1 eth-rt1 rt3(4)
rt5 eth-rt5 rt7(4)
10.39.0.0/24 IP TE 40 rt1 eth-rt1 rt3(4)
3.3.3.3/32 IP TE 40 rt1 eth-rt1 rt3(4)
10.78.0.0/24 IP TE 40 rt5 eth-rt5 rt7(4)
10.79.0.0/24 IP TE 40 rt5 eth-rt5 rt7(4)
7.7.7.7/32 IP TE 40 rt5 eth-rt5 rt7(4)
9.9.9.9/32 IP TE 50 rt1 eth-rt1 rt9(4)
rt5 eth-rt5
IS-IS routes information for a given Flex-Algorithm¶
Show the IS-IS routes for the Flex-Algorithm 130
rt0> show isis route flex-algorithm 130
Area 1: Algorithm 130
IS-IS L1 IPv4 routing table:
Prefix Metric Interface Nexthop Label(s)
------------------------------------------------------------
1.1.1.1/32 20 eth-rt1 10.1.0.1 implicit-null
2.2.2.2/32 30 eth-rt1 10.1.0.1 20302
3.3.3.3/32 40 eth-rt1 10.1.0.1 20303
5.5.5.5/32 20 eth-rt5 10.5.0.5 implicit-null
6.6.6.6/32 30 eth-rt5 10.5.0.5 20306
7.7.7.7/32 40 eth-rt5 10.5.0.5 20307
9.9.9.9/32 50 eth-rt1 10.1.0.1 20309
eth-rt5 10.5.0.5 20309
10.1.0.0/24 20 eth-rt1 10.1.0.1 -
10.5.0.0/24 20 eth-rt5 10.5.0.5 -
10.10.10.10/32 0 - - -
10.12.0.0/24 20 eth-rt1 10.1.0.1 -
10.14.0.0/24 20 eth-rt1 10.1.0.1 -
10.15.0.0/24 20 eth-rt1 10.1.0.1 -
eth-rt5 10.5.0.5 -
10.23.0.0/24 30 eth-rt1 10.1.0.1 -
10.26.0.0/24 30 eth-rt1 10.1.0.1 -
eth-rt5 10.5.0.5 -
10.34.0.0/24 40 eth-rt1 10.1.0.1 -
10.37.0.0/24 40 eth-rt1 10.1.0.1 -
eth-rt5 10.5.0.5 -
10.39.0.0/24 40 eth-rt1 10.1.0.1 -
10.56.0.0/24 20 eth-rt5 10.5.0.5 -
10.58.0.0/24 20 eth-rt5 10.5.0.5 -
10.67.0.0/24 30 eth-rt5 10.5.0.5 -
10.78.0.0/24 40 eth-rt5 10.5.0.5 -
10.79.0.0/24 40 eth-rt5 10.5.0.5 -
Paths from rt0 to rt9 in Flex-Algorithm 130¶
The available paths from rt0 to rt9 do not transit by rt4 and rt8 as
expected.
rt0> show isis route flex-algorithm 130
Area 1: Algorithm 130
IS-IS L1 IPv4 routing table:
Prefix Metric Interface Nexthop Label(s)
------------------------------------------------------------
(...)
9.9.9.9/32 50 eth-rt1 10.1.0.1 20309
eth-rt5 10.5.0.5 20309
(...)
rt1> show isis route flex-algorithm 130
(...)
9.9.9.9/32 40 eth-rt2 10.12.0.2 20309
(...)
rt2> show isis route flex-algorithm 130
(...)
9.9.9.9/32 30 eth-rt3 10.23.0.3 20309
(...)
rt3> show isis route flex-algorithm 130
(...)
9.9.9.9/32 20 eth-rt9 10.39.0.9 implicit-null
(...)
rt4> show isis route flex-algorithm 130
< no data >
rt5> show isis route flex-algorithm 130
(...)
9.9.9.9/32 40 eth-rt6 10.56.0.6 20309
(...)
rt6> show isis route flex-algorithm 130
(...)
9.9.9.9/32 30 eth-rt7 10.67.0.7 20309
(...)
rt7> show isis route flex-algorithm 130
(...)
9.9.9.9/32 20 eth-rt9 10.79.0.9 implicit-null
(...)
rt8> show isis route flex-algorithm 130
Prefix Metric Interface Nexthop Label(s)
----------------------------------------------------
8.8.8.8/32 0 - - -
10.48.0.0/24 0 - - -
10.58.0.0/24 0 - - -
10.78.0.0/24 0 - - -
Routes on Flex-Algorithm 130 to rt9 follow the arrows.¶
Other configuration options¶
Exclude-any constraints¶
The exclude-any constraint means that the compute paths must avoid any link
with the specified affinities.
The Flex-Algorithm 129 is going to be configured with the following specifications:
The Flex-Algorithm 129 is enabled on all routers, except
rt4.The Flex-Algorithm Definition is advertised from
rt0andrt9with the following characteristics:Algorithm ID: 129
Metric type: IGP (default value)
Exclude-Any link constraint: affinity red - bit position 1
Priority of the definition: 128 (default value)
The link affinity red is added between:
rt5andrt6rt6andrt9
Desired topology for Flex-Algorithm 129¶
rt5, rt6 and rt9
rt1 running config# / routing traffic-engineering affinity-map red bit-position 1
rt5
rt5 running config# / vrf main routing interface eth-rt6 traffic-engineering affinity-map red
rt6
rt6 running config# / vrf main routing interface eth-rt5 traffic-engineering affinity-map red
rt6 running config# / vrf main routing interface eth-rt9 traffic-engineering affinity-map red
rt9
rt6 running config# / vrf main routing interface eth-rt6 traffic-engineering affinity-map red
rt0 and similarly for all other routers
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 129
rt0 running flex-algorithm 129# segment-routing prefix-sid-map 10.10.10.10/32 sid-value 200
rt0 to rt9 except rt4
rt0 running config# / vrf main routing isis instance 1
rt0 running instance 1# flex-algorithm 129
rt0 running flex-algorithm 129# dataplane sr-mpls
rt0 and rt9
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 129
rt0 running flex-algorithm 129# definition advertise true
rt0 running flex-algorithm 129# definition affinity exclude-any red
The winning FAD is coming from rt9.
rt0> show isis flex-algorithm 129
Area 1: Algorithm 129
Enabled Data-Planes: SR-MPLS
Elected and running Flexible-Algorithm Definition:
Source: 0000.0000.1009
Priority: 128
Equal to local: yes
Local state: enabled
Calculation type: spf
Metric type: igp
Prefix-metric: disabled
Exclude SRLG: disabled
Exclude-any admin-group: 0x00000002
Bit positions: 1
Include-all admin-group: not-set
Include-any admin-group: not-set
Routes on Flex-Algorithm 129 to rt9 follow the arrows.¶
Include-all constraints¶
The include-all constraint means that the compute paths must only choose the
links that include all the specified affinities.
The Flex-Algorithm 128 is going to be configured with the following specifications:
The Flex-Algorithm 128 is enabled on all routers, except
rt4.The Flex-Algorithm Definition is advertised from
rt0andrt9with the following characteristics:Algorithm ID: 128
Metric type: IGP (default value)
Include-All link constraint:
affinity blue - bit position 0
affinity green - bit position 2
The link affinity green is added between:
rt0andrt5rt5andrt6rt6andrt7rt7andrt9
Desired topology for Flex-Algorithm 128¶
rt0, rt5, rt6, rt7 and rt9
rt0 running config# / routing traffic-engineering affinity-map green bit-position 2
rt0
rt0 running config# / vrf main routing interface eth-rt5 traffic-engineering affinity-map green
rt6
rt6 running config# / vrf main routing interface eth-rt5 traffic-engineering affinity-map green
rt6 running config# / vrf main routing interface eth-rt7 traffic-engineering affinity-map green
rt7
rt7 running config# / vrf main routing interface eth-rt6 traffic-engineering affinity-map green
rt7 running config# / vrf main routing interface eth-rt9 traffic-engineering affinity-map green
rt5
rt5 running config# / vrf main routing interface eth-rt0 traffic-engineering affinity-map green
rt5 running config# / vrf main routing interface eth-rt6 traffic-engineering affinity-map green
rt9
rt9 running config# / vrf main routing interface eth-rt7 traffic-engineering affinity-map green
rt0 and similarly for all other routers
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 128
rt0 running flex-algorithm 128# segment-routing prefix-sid-map 10.10.10.10/32 sid-value 100
rt0 to rt9 except rt4
rt0 running config# / vrf main routing isis instance 1
rt0 running instance 1# flex-algorithm 128
rt0 running flex-algorithm 128# dataplane sr-mpls
rt0 and rt9
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 128
rt0 running flex-algorithm 128# definition advertise true
rt0 running flex-algorithm 128# definition affinity include-all blue
rt0 running flex-algorithm 128# definition affinity include-all green
The winning FAD is coming from rt9.
rt0> show isis flex-algorithm 128
Area 1: Algorithm 128
Enabled Data-Planes: SR-MPLS
Elected and running Flexible-Algorithm Definition:
Source: 0000.0000.1009
Priority: 128
Equal to local: yes
Local state: enabled
Calculation type: spf
Metric type: igp
Prefix-metric: disabled
Exclude SRLG: disabled
Exclude-any admin-group: not-set
Include-all admin-group: 0x00000005
Bit positions: 0, 3
Include-any admin-group: not-set
Routes on Flex-Algorithm 128 to rt9 follow the arrows.¶
Traffic-Engineering metrics¶
The TE metric is administratively assigned and can be used to present a differently weighted topology to TE SPF calculations. A Flex-Algorithm can use the TE metrics instead of the default IGP one to compute the paths.
The Flex-Algorithm 131 is going to be configured with the following specifications:
The Flex-Algorithm 131 is enabled on all routers.
The Flex-Algorithm Definition is advertised from
rt0andrt9with the following characteristics:Algorithm ID: 131
Metric type: TE metric
rt0 and similarly for all other routers
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 131
rt0 running flex-algorithm 131# segment-routing prefix-sid-map 10.10.10.10/32 sid-value 400
rt0 running flex-algorithm 131# dataplane sr-mpls
rt0 and rt9
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 131
rt0 running flex-algorithm 131# definition advertise true
rt0 running flex-algorithm 131# metric-type te
No TE metrics are configured yet on IS-IS interfaces. When no such values are provided, the SPF algorithm does not use the IGP metric instead nor discards the link from the SPF tree. It utilizes for these links the default cost value of 2^24 - 1 (that is 16777215), which provides paths with a high total cost that can be selected if no better costs exist.
rt0> show isis topology flex-algorithm 131
Area 1: Algorithm 131
IS-IS paths to level-1 routers that speak IP
Vertex Type Metric Next-Hop Interface Parent
rt0
10.1.0.0/24 IP internal 0 rt0(4)
10.5.0.0/24 IP internal 0 rt0(4)
10.10.10.10/32 IP internal 0 rt0(4)
rt1 TE-IS 16777215 rt1 eth-rt1 rt0(4)
rt5 TE-IS 16777215 rt5 eth-rt5 rt0(4)
10.1.0.0/24 IP TE 16777225 rt1 eth-rt1 rt1(4)
10.12.0.0/24 IP TE 16777225 rt1 eth-rt1 rt1(4)
10.14.0.0/24 IP TE 16777225 rt1 eth-rt1 rt1(4)
10.15.0.0/24 IP TE 16777225 rt1 eth-rt1 rt1(4)
rt5 eth-rt5 rt5(4)
1.1.1.1/32 IP TE 16777225 rt1 eth-rt1 rt1(4)
10.5.0.0/24 IP TE 16777225 rt5 eth-rt5 rt5(4)
10.56.0.0/24 IP TE 16777225 rt5 eth-rt5 rt5(4)
10.58.0.0/24 IP TE 16777225 rt5 eth-rt5 rt5(4)
5.5.5.5/32 IP TE 16777225 rt5 eth-rt5 rt5(4)
rt8 TE-IS 16777315 rt5 eth-rt5 rt5(4)
10.48.0.0/24 IP TE 16777325 rt5 eth-rt5 rt8(4)
10.78.0.0/24 IP TE 16777325 rt5 eth-rt5 rt8(4)
8.8.8.8/32 IP TE 16777325 rt5 eth-rt5 rt8(4)
rt7 TE-IS 16778315 rt5 eth-rt5 rt8(4)
10.37.0.0/24 IP TE 16778325 rt5 eth-rt5 rt7(4)
10.67.0.0/24 IP TE 16778325 rt5 eth-rt5 rt7(4)
10.79.0.0/24 IP TE 16778325 rt5 eth-rt5 rt7(4)
7.7.7.7/32 IP TE 16778325 rt5 eth-rt5 rt7(4)
rt2 TE-IS 33554430 rt1 eth-rt1 rt1(4)
rt4 TE-IS 33554430 rt1 eth-rt1 rt1(4)
rt6 TE-IS 33554430 rt5 eth-rt5 rt5(4)
10.23.0.0/24 IP TE 33554440 rt1 eth-rt1 rt2(4)
10.26.0.0/24 IP TE 33554440 rt1 eth-rt1 rt2(4)
rt5 eth-rt5 rt6(4)
2.2.2.2/32 IP TE 33554440 rt1 eth-rt1 rt2(4)
10.34.0.0/24 IP TE 33554440 rt1 eth-rt1 rt4(4)
4.4.4.4/32 IP TE 33554440 rt1 eth-rt1 rt4(4)
10.69.0.0/24 IP TE 33554440 rt5 eth-rt5 rt6(4)
6.6.6.6/32 IP TE 33554440 rt5 eth-rt5 rt6(4)
rt9 TE-IS 33554480 rt5 eth-rt5 rt6(4)
10.39.0.0/24 IP TE 33554490 rt5 eth-rt5 rt9(4)
9.9.9.9/32 IP TE 33554490 rt5 eth-rt5 rt9(4)
rt3 TE-IS 33554530 rt1 eth-rt1 rt2(4)
3.3.3.3/32 IP TE 33554540 rt1 eth-rt1 rt3(4)
TE metrics are now set to the values of the following diagram:
Desired topology for Flex-Algorithm 131. Link values are the TE metric. No value means that no TE metric is advertised for the link.¶
For example, the TE metric is set on rt0 eth-rt1 and eth-rt5 according to the diagram.
rt0 and similarly for all other routers
rt0 running config# / vrf main routing interface eth-rt1 traffic-engineering
rt0 running traffic-engineering# metric 100
rt0 running traffic-engineering# /
rt0 running config# / vrf main routing interface eth-rt5 traffic-engineering
rt0 running traffic-engineering# metric 1000
rt0> show isis topology flex-algorithm 131
Area 1: Algorithm 131
IS-IS paths to level-1 routers that speak IP
Vertex Type Metric Next-Hop Interface Parent
rt0
10.1.0.0/24 IP internal 0 rt0(4)
10.5.0.0/24 IP internal 0 rt0(4)
10.10.10.10/32 IP internal 0 rt0(4)
rt1 TE-IS 100 rt1 eth-rt1 rt0(4)
10.1.0.0/24 IP TE 110 rt1 eth-rt1 rt1(4)
10.12.0.0/24 IP TE 110 rt1 eth-rt1 rt1(4)
10.14.0.0/24 IP TE 110 rt1 eth-rt1 rt1(4)
10.15.0.0/24 IP TE 110 rt1 eth-rt1 rt1(4)
1.1.1.1/32 IP TE 110 rt1 eth-rt1 rt1(4)
rt2 TE-IS 200 rt1 eth-rt1 rt1(4)
10.23.0.0/24 IP TE 210 rt1 eth-rt1 rt2(4)
10.26.0.0/24 IP TE 210 rt1 eth-rt1 rt2(4)
2.2.2.2/32 IP TE 210 rt1 eth-rt1 rt2(4)
rt6 TE-IS 250 rt1 eth-rt1 rt2(4)
10.56.0.0/24 IP TE 260 rt1 eth-rt1 rt6(4)
10.67.0.0/24 IP TE 260 rt1 eth-rt1 rt6(4)
10.69.0.0/24 IP TE 260 rt1 eth-rt1 rt6(4)
6.6.6.6/32 IP TE 260 rt1 eth-rt1 rt6(4)
rt3 TE-IS 300 rt1 eth-rt1 rt2(4)
rt9 TE-IS 300 rt1 eth-rt1 rt6(4)
10.34.0.0/24 IP TE 310 rt1 eth-rt1 rt3(4)
10.37.0.0/24 IP TE 310 rt1 eth-rt1 rt3(4)
10.39.0.0/24 IP TE 310 rt1 eth-rt1 rt3(4)
rt9(4)
3.3.3.3/32 IP TE 310 rt1 eth-rt1 rt3(4)
10.79.0.0/24 IP TE 310 rt1 eth-rt1 rt9(4)
9.9.9.9/32 IP TE 310 rt1 eth-rt1 rt9(4)
rt5 TE-IS 1000 rt5 eth-rt5 rt0(4)
10.5.0.0/24 IP TE 1010 rt5 eth-rt5 rt5(4)
10.58.0.0/24 IP TE 1010 rt5 eth-rt5 rt5(4)
5.5.5.5/32 IP TE 1010 rt5 eth-rt5 rt5(4)
rt8 TE-IS 1100 rt5 eth-rt5 rt5(4)
10.48.0.0/24 IP TE 1110 rt5 eth-rt5 rt8(4)
10.78.0.0/24 IP TE 1110 rt5 eth-rt5 rt8(4)
8.8.8.8/32 IP TE 1110 rt5 eth-rt5 rt8(4)
rt7 TE-IS 1300 rt1 eth-rt1 rt9(4)
7.7.7.7/32 IP TE 1310 rt1 eth-rt1 rt7(4)
rt4 TE-IS 16777315 rt1 eth-rt1 rt1(4)
4.4.4.4/32 IP TE 16777325 rt1 eth-rt1 rt4(4)
rt0> show isis route flex-algorithm 131
Area 1: Algorithm 131
IS-IS L1 IPv4 routing table:
Prefix Metric Interface Nexthop Label(s)
--------------------------------------------------------------
1.1.1.1/32 110 eth-rt1 10.1.0.1 implicit-null
2.2.2.2/32 210 eth-rt1 10.1.0.1 20402
3.3.3.3/32 310 eth-rt1 10.1.0.1 20403
4.4.4.4/32 16777325 eth-rt1 10.1.0.1 20404
5.5.5.5/32 1010 eth-rt5 10.5.0.5 implicit-null
6.6.6.6/32 260 eth-rt1 10.1.0.1 20406
7.7.7.7/32 1310 eth-rt1 10.1.0.1 20407
8.8.8.8/32 1110 eth-rt5 10.5.0.5 20408
9.9.9.9/32 310 eth-rt1 10.1.0.1 20409
10.1.0.0/24 110 eth-rt1 10.1.0.1 -
10.5.0.0/24 1010 eth-rt5 10.5.0.5 -
10.10.10.10/32 0 - - -
10.12.0.0/24 110 eth-rt1 10.1.0.1 -
10.14.0.0/24 110 eth-rt1 10.1.0.1 -
10.15.0.0/24 110 eth-rt1 10.1.0.1 -
10.23.0.0/24 210 eth-rt1 10.1.0.1 -
10.26.0.0/24 210 eth-rt1 10.1.0.1 -
10.34.0.0/24 310 eth-rt1 10.1.0.1 -
10.37.0.0/24 310 eth-rt1 10.1.0.1 -
10.39.0.0/24 310 eth-rt1 10.1.0.1 -
10.48.0.0/24 1110 eth-rt5 10.5.0.5 -
10.56.0.0/24 260 eth-rt1 10.1.0.1 -
10.58.0.0/24 1010 eth-rt5 10.5.0.5 -
10.67.0.0/24 260 eth-rt1 10.1.0.1 -
10.69.0.0/24 260 eth-rt1 10.1.0.1 -
10.78.0.0/24 1110 eth-rt5 10.5.0.5 -
10.79.0.0/24 310 eth-rt1 10.1.0.1 -
Routes on Flex-Algorithm 131 to rt9 follow the arrows.¶
Traffic-Engineering delay metrics¶
The value of link delay can be used as a weight to compute the paths of a specific Flex-Algorithm so that the routes use the paths with the shortest delay.
The Flex-Algorithm 132 is going to be configured with the following specifications:
The Flex-Algorithm 132 is enabled on all routers.
The Flex-Algorithm Definition is advertised from
rt0andrt9with the following characteristics:Algorithm ID: 132
Metric type: delay
rt0 and similarly for all other routers
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 132
rt0 running flex-algorithm 132# segment-routing prefix-sid-map 10.10.10.10/32 sid-value 500
rt0 running flex-algorithm 132# dataplane sr-mpls
rt0 and rt9
rt0 running config# / vrf main routing isis instance 1 flex-algorithm 132
rt0 running flex-algorithm 132# definition advertise true
rt0 running flex-algorithm 132# metric-type delay
Routers advertise the delay values within the “Extended IS Reachability” TLV
according to RFC 8570 and are considered as a TE metric extension. This
TLV carries the average, minimum and maximum link delay. However, a
Flex-Algorithm with delay as the metric type only utilizes the minimum link
delay value for the path computation.
Delays are now set to the values of the following diagram:
Desired topology for Flex-Algorithm 132. Link values are the minimum link delay. No value means that no delay values are advertised for the link.¶
For example, the minimum delay value is set on rt0 eth-rt1 and eth-rt5 according to the diagram. The configured values are converted from milliseconds to microseconds.
rt0 and similarly for all other routers
rt0 running config# / vrf main routing interface eth-rt1 traffic-engineering
rt0 running traffic-engineering# delay average 150000 minimum 100000 maximum 200000
rt0 running traffic-engineering# /
rt0 running config# / vrf main routing interface eth-rt5 traffic-engineering
rt0 running traffic-engineering# delay average 150000 minimum 100000 maximum 200000
The configured delay values should be defined as follows:
minimum: the lowest measured delay on the link. It corresponds to the time for a packet to be received by the remote router after its emission when the link is not overloaded.
maximum: the highest measured delay on the link. It corresponds to the time for a packet to be received by the remote router after its emission when the link is overloaded.
average: the average measured delay on the link. Its value must be superior to the minimum and inferior to the maximum one.
When a router has no information about the minimum delay of a particular link or when it gets a zero minimum delay value, it assigns to the link a delay value of 2^24 - 1 microseconds (that is 16777215 microseconds).
rt0> show isis topology flex-algorithm 132
Area 1: Algorithm 132
IS-IS paths to level-1 routers that speak IP
Vertex Type Metric Next-Hop Interface Parent
rt0
10.1.0.0/24 IP internal 0 rt0(4)
10.5.0.0/24 IP internal 0 rt0(4)
10.10.10.10/32 IP internal 0 rt0(4)
rt1 TE-IS 10000 rt1 eth-rt1 rt0(4)
10.1.0.0/24 IP TE 10010 rt1 eth-rt1 rt1(4)
10.12.0.0/24 IP TE 10010 rt1 eth-rt1 rt1(4)
10.14.0.0/24 IP TE 10010 rt1 eth-rt1 rt1(4)
10.15.0.0/24 IP TE 10010 rt1 eth-rt1 rt1(4)
1.1.1.1/32 IP TE 10010 rt1 eth-rt1 rt1(4)
rt2 TE-IS 20000 rt1 eth-rt1 rt1(4)
10.23.0.0/24 IP TE 20010 rt1 eth-rt1 rt2(4)
10.26.0.0/24 IP TE 20010 rt1 eth-rt1 rt2(4)
2.2.2.2/32 IP TE 20010 rt1 eth-rt1 rt2(4)
rt6 TE-IS 25000 rt1 eth-rt1 rt2(4)
10.56.0.0/24 IP TE 25010 rt1 eth-rt1 rt6(4)
10.67.0.0/24 IP TE 25010 rt1 eth-rt1 rt6(4)
10.69.0.0/24 IP TE 25010 rt1 eth-rt1 rt6(4)
6.6.6.6/32 IP TE 25010 rt1 eth-rt1 rt6(4)
rt3 TE-IS 30000 rt1 eth-rt1 rt2(4)
rt9 TE-IS 30000 rt1 eth-rt1 rt6(4)
10.34.0.0/24 IP TE 30010 rt1 eth-rt1 rt3(4)
10.37.0.0/24 IP TE 30010 rt1 eth-rt1 rt3(4)
10.39.0.0/24 IP TE 30010 rt1 eth-rt1 rt3(4)
rt9(4)
3.3.3.3/32 IP TE 30010 rt1 eth-rt1 rt3(4)
10.79.0.0/24 IP TE 30010 rt1 eth-rt1 rt9(4)
9.9.9.9/32 IP TE 30010 rt1 eth-rt1 rt9(4)
rt5 TE-IS 100000 rt5 eth-rt5 rt0(4)
10.5.0.0/24 IP TE 100010 rt5 eth-rt5 rt5(4)
10.58.0.0/24 IP TE 100010 rt5 eth-rt5 rt5(4)
5.5.5.5/32 IP TE 100010 rt5 eth-rt5 rt5(4)
rt8 TE-IS 110000 rt5 eth-rt5 rt5(4)
10.48.0.0/24 IP TE 110010 rt5 eth-rt5 rt8(4)
10.78.0.0/24 IP TE 110010 rt5 eth-rt5 rt8(4)
8.8.8.8/32 IP TE 110010 rt5 eth-rt5 rt8(4)
rt7 TE-IS 130000 rt1 eth-rt1 rt9(4)
7.7.7.7/32 IP TE 130010 rt1 eth-rt1 rt7(4)
rt4 TE-IS 16787215 rt1 eth-rt1 rt1(4)
4.4.4.4/32 IP TE 16787225 rt1 eth-rt1 rt4(4)
rt0> show isis route flex-algorithm 132
Area 1: Algorithm 132
IS-IS L1 IPv4 routing table:
Prefix Metric Interface Nexthop Label(s)
--------------------------------------------------------------
1.1.1.1/32 10010 eth-rt1 10.1.0.1 implicit-null
2.2.2.2/32 20010 eth-rt1 10.1.0.1 20502
3.3.3.3/32 30010 eth-rt1 10.1.0.1 20503
4.4.4.4/32 16787225 eth-rt1 10.1.0.1 20504
5.5.5.5/32 100010 eth-rt5 10.5.0.5 implicit-null
6.6.6.6/32 25010 eth-rt1 10.1.0.1 20506
7.7.7.7/32 130010 eth-rt1 10.1.0.1 20507
8.8.8.8/32 110010 eth-rt5 10.5.0.5 20508
9.9.9.9/32 30010 eth-rt1 10.1.0.1 20509
10.1.0.0/24 10010 eth-rt1 10.1.0.1 -
10.5.0.0/24 100010 eth-rt5 10.5.0.5 -
10.10.10.10/32 0 - - -
10.12.0.0/24 10010 eth-rt1 10.1.0.1 -
10.14.0.0/24 10010 eth-rt1 10.1.0.1 -
10.15.0.0/24 10010 eth-rt1 10.1.0.1 -
10.23.0.0/24 20010 eth-rt1 10.1.0.1 -
10.26.0.0/24 20010 eth-rt1 10.1.0.1 -
10.34.0.0/24 30010 eth-rt1 10.1.0.1 -
10.37.0.0/24 30010 eth-rt1 10.1.0.1 -
10.39.0.0/24 30010 eth-rt1 10.1.0.1 -
10.48.0.0/24 110010 eth-rt5 10.5.0.5 -
10.56.0.0/24 25010 eth-rt1 10.1.0.1 -
10.58.0.0/24 100010 eth-rt5 10.5.0.5 -
10.67.0.0/24 25010 eth-rt1 10.1.0.1 -
10.69.0.0/24 25010 eth-rt1 10.1.0.1 -
10.78.0.0/24 110010 eth-rt5 10.5.0.5 -
10.79.0.0/24 30010 eth-rt1 10.1.0.1 -
Routes on Flex-Algorithm 132 to rt9 follow the arrows.¶
Fast-reroute¶
Fast-reroute (aka LFA) can benefit to Flex-Algorithm as well. The classic LFA or TI-LFA configuration enables fast-reroute for the default and all running Flex-Algorithms. Enabling TI-LFA is preferred over LFA because it can pre-compute all possible backup paths. Configuring TI-LFA is no more complex than configuring LFA when an SR dataplane is already configured.
TI-LFA is enabled on all IS-IS interfaces except loopback interfaces.
rt0 and similarly for all other routers
rt0 running config# / vrf main routing interface eth-rt1 isis fast-reroute ti-lfa level-1 enabled true
rt0 running config# / vrf main routing interface eth-rt5 isis fast-reroute ti-lfa level-1 enabled true
rt0> show isis route backup algorithm 131
Area 1: Algorithm 131
IS-IS L1 IPv4 routing table:
Prefix Metric Interface Nexthop Label(s)
----------------------------------------------------------
1.1.1.1/32 3310 eth-rt5 10.5.0.5 20407/20401
2.2.2.2/32 3210 eth-rt5 10.5.0.5 20407/20402
3.3.3.3/32 3210 eth-rt5 10.5.0.5 20407/20403
4.4.4.4/32 16778325 eth-rt5 10.5.0.5 20404
5.5.5.5/32 3310 eth-rt1 10.1.0.1 20407/20405
6.6.6.6/32 3160 eth-rt5 10.5.0.5 20407/20406
7.7.7.7/32 2110 eth-rt5 10.5.0.5 20407
8.8.8.8/32 2310 eth-rt1 10.1.0.1 20407/20408
9.9.9.9/32 3110 eth-rt5 10.5.0.5 20407/20409
10.1.0.0/24 3310 eth-rt5 10.5.0.5 20407
10.5.0.0/24 3310 eth-rt1 10.1.0.1 20407
10.12.0.0/24 3210 eth-rt5 10.5.0.5 20407
10.14.0.0/24 3310 eth-rt5 10.5.0.5 20407
10.15.0.0/24 1010 eth-rt5 10.5.0.5 -
10.23.0.0/24 3210 eth-rt5 10.5.0.5 20407
10.26.0.0/24 3160 eth-rt5 10.5.0.5 20407
10.34.0.0/24 3210 eth-rt5 10.5.0.5 20407
10.37.0.0/24 2110 eth-rt5 10.5.0.5 -
10.39.0.0/24 3110 eth-rt5 10.5.0.5 20407
10.48.0.0/24 2310 eth-rt1 10.1.0.1 20407
10.56.0.0/24 1010 eth-rt5 10.5.0.5 -
10.58.0.0/24 2310 eth-rt1 10.1.0.1 20407
10.67.0.0/24 2110 eth-rt5 10.5.0.5 -
10.69.0.0/24 3110 eth-rt5 10.5.0.5 20407
10.78.0.0/24 1310 eth-rt1 10.1.0.1 -
10.79.0.0/24 2110 eth-rt5 10.5.0.5 -
See also
Refer to the Fast-Reroute chapter for details.
Using the Flex-Algorithm routes in the FIB¶
The routes from Flex-Algorithm are not installed into the FIB unless Flex-Algorithm Segment-Routing Traffic Engineering is configured.
Full rt0 to rt9 configuration¶
The examples of this page use the below configurations.
rt0
/ system hostname rt0
/ vrf main interface physical eth-rt1 ipv4 address 10.1.0.10/24
/ vrf main interface physical eth-rt1 port pci-b0s4
/ vrf main interface physical eth-rt5 ipv4 address 10.5.0.10/24
/ vrf main interface physical eth-rt5 port pci-b0s5
/ vrf main interface loopback loop1 ipv4 address 10.10.10.10/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt1 isis area-tag 1
/ vrf main routing interface eth-rt1 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt1 isis ipv4-routing true
/ vrf main routing interface eth-rt1 isis network-point-to-point true
/ vrf main routing interface eth-rt1 traffic-engineering metric 100
/ vrf main routing interface eth-rt1 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing interface eth-rt5 isis area-tag 1
/ vrf main routing interface eth-rt5 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt5 isis ipv4-routing true
/ vrf main routing interface eth-rt5 isis network-point-to-point true
/ vrf main routing interface eth-rt5 traffic-engineering metric 1000
/ vrf main routing interface eth-rt5 traffic-engineering delay average 150000 minimum 100000 maximum 200000
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1000.00
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 10.10.10.10/32 sid-value 0
/ routing traffic-engineering affinity-map blue bit-position 0
/ routing traffic-engineering affinity-map red bit-position 1
/ routing traffic-engineering affinity-map green bit-position 2
/ vrf main routing interface eth-rt1 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt5 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt5 traffic-engineering affinity-map green
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 10.10.10.10/32 sid-value 500
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 10.10.10.10/32 sid-value 400
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 10.10.10.10/32 sid-value 300
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 10.10.10.10/32 sid-value 200
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 10.10.10.10/32 sid-value 100
/ vrf main routing isis instance 1 flex-algorithm 132 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 132 definition metric-type delay
/ vrf main routing isis instance 1 flex-algorithm 132 definition prefix-metric false
/ vrf main routing isis instance 1 flex-algorithm 131 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 131 definition metric-type te
/ vrf main routing isis instance 1 flex-algorithm 131 definition prefix-metric false
/ vrf main routing isis instance 1 flex-algorithm 130 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 130 definition affinity include-any blue
/ vrf main routing isis instance 1 flex-algorithm 129 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 129 definition affinity exclude-any red
/ vrf main routing isis instance 1 flex-algorithm 128 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 128 definition affinity include-all blue
/ vrf main routing isis instance 1 flex-algorithm 128 definition affinity include-all green
rt1
/ system hostname rt1
/ vrf main interface physical eth-rt0 ipv4 address 10.1.0.1/24
/ vrf main interface physical eth-rt0 port pci-b0s4
/ vrf main interface physical eth-rt2 ipv4 address 10.12.0.1/24
/ vrf main interface physical eth-rt2 port pci-b0s5
/ vrf main interface physical eth-rt4 ipv4 address 10.14.0.1/24
/ vrf main interface physical eth-rt4 port pci-b0s6
/ vrf main interface physical eth-rt5 ipv4 address 10.15.0.1/24
/ vrf main interface physical eth-rt5 port pci-b0s7
/ vrf main interface loopback loop1 ipv4 address 1.1.1.1/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing interface eth-rt0 isis area-tag 1
/ vrf main routing interface eth-rt0 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt0 isis ipv4-routing true
/ vrf main routing interface eth-rt0 isis network-point-to-point true
/ vrf main routing interface eth-rt0 traffic-engineering metric 100
/ vrf main routing interface eth-rt0 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing interface eth-rt2 isis area-tag 1
/ vrf main routing interface eth-rt2 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt2 isis ipv4-routing true
/ vrf main routing interface eth-rt2 isis network-point-to-point true
/ vrf main routing interface eth-rt2 traffic-engineering metric 100
/ vrf main routing interface eth-rt2 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing interface eth-rt4 isis area-tag 1
/ vrf main routing interface eth-rt4 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt4 isis ipv4-routing true
/ vrf main routing interface eth-rt4 isis network-point-to-point true
/ vrf main routing interface eth-rt5 isis area-tag 1
/ vrf main routing interface eth-rt5 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt5 isis ipv4-routing true
/ vrf main routing interface eth-rt5 isis network-point-to-point true
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1001.00
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 1.1.1.1/32 sid-value 1
/ routing traffic-engineering affinity-map blue bit-position 0
/ vrf main routing interface eth-rt0 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt2 traffic-engineering affinity-map blue
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 1.1.1.1/32 sid-value 501
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 1.1.1.1/32 sid-value 401
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 1.1.1.1/32 sid-value 301
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 1.1.1.1/32 sid-value 201
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 1.1.1.1/32 sid-value 101
rt2
/ system hostname rt2
/ vrf main interface physical eth-rt1 ipv4 address 10.12.0.2/24
/ vrf main interface physical eth-rt1 port pci-b0s4
/ vrf main interface physical eth-rt3 ipv4 address 10.23.0.2/24
/ vrf main interface physical eth-rt3 port pci-b0s5
/ vrf main interface physical eth-rt6 ipv4 address 10.26.0.2/24
/ vrf main interface physical eth-rt6 port pci-b0s6
/ vrf main interface loopback loop1 ipv4 address 2.2.2.2/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt1 isis area-tag 1
/ vrf main routing interface eth-rt1 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt1 isis ipv4-routing true
/ vrf main routing interface eth-rt1 isis network-point-to-point true
/ vrf main routing interface eth-rt1 traffic-engineering metric 100
/ vrf main routing interface eth-rt1 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing interface eth-rt3 isis area-tag 1
/ vrf main routing interface eth-rt3 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt3 isis ipv4-routing true
/ vrf main routing interface eth-rt3 isis network-point-to-point true
/ vrf main routing interface eth-rt3 traffic-engineering metric 100
/ vrf main routing interface eth-rt3 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing interface eth-rt6 isis area-tag 1
/ vrf main routing interface eth-rt6 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt6 isis ipv4-routing true
/ vrf main routing interface eth-rt6 isis network-point-to-point true
/ vrf main routing interface eth-rt6 traffic-engineering metric 50
/ vrf main routing interface eth-rt6 traffic-engineering delay average 7500 minimum 5000 maximum 10000
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1002.00
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 2.2.2.2/32 sid-value 2
/ routing traffic-engineering affinity-map blue bit-position 0
/ vrf main routing interface eth-rt1 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt3 traffic-engineering affinity-map blue
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 2.2.2.2/32 sid-value 502
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 2.2.2.2/32 sid-value 402
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 2.2.2.2/32 sid-value 302
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 2.2.2.2/32 sid-value 202
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 2.2.2.2/32 sid-value 102
rt3
/ system hostname rt3
/ vrf main interface physical eth-rt2 ipv4 address 10.23.0.3/24
/ vrf main interface physical eth-rt2 port pci-b0s4
/ vrf main interface physical eth-rt4 ipv4 address 10.34.0.3/24
/ vrf main interface physical eth-rt4 port pci-b0s5
/ vrf main interface physical eth-rt7 ipv4 address 10.37.0.3/24
/ vrf main interface physical eth-rt7 port pci-b0s6
/ vrf main interface physical eth-rt9 ipv4 address 10.39.0.3/24
/ vrf main interface physical eth-rt9 port pci-b0s7
/ vrf main interface loopback loop1 ipv4 address 3.3.3.3/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt2 isis area-tag 1
/ vrf main routing interface eth-rt2 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt2 isis ipv4-routing true
/ vrf main routing interface eth-rt2 isis network-point-to-point true
/ vrf main routing interface eth-rt2 traffic-engineering metric 100
/ vrf main routing interface eth-rt2 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing interface eth-rt4 isis area-tag 1
/ vrf main routing interface eth-rt4 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt4 isis ipv4-routing true
/ vrf main routing interface eth-rt4 isis network-point-to-point true
/ vrf main routing interface eth-rt7 isis area-tag 1
/ vrf main routing interface eth-rt7 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt7 isis ipv4-routing true
/ vrf main routing interface eth-rt7 isis network-point-to-point true
/ vrf main routing interface eth-rt9 isis area-tag 1
/ vrf main routing interface eth-rt9 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt9 isis ipv4-routing true
/ vrf main routing interface eth-rt9 isis network-point-to-point true
/ vrf main routing interface eth-rt9 traffic-engineering metric 100
/ vrf main routing interface eth-rt9 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1003.00
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 3.3.3.3/32 sid-value 3
/ routing traffic-engineering affinity-map blue bit-position 0
/ vrf main routing interface eth-rt9 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt2 traffic-engineering affinity-map blue
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 3.3.3.3/32 sid-value 503
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 3.3.3.3/32 sid-value 403
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 3.3.3.3/32 sid-value 303
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 3.3.3.3/32 sid-value 203
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 3.3.3.3/32 sid-value 103
rt4
/ system hostname rt4
/ vrf main interface physical eth-rt1 ipv4 address 10.14.0.4/24
/ vrf main interface physical eth-rt1 port pci-b0s4
/ vrf main interface physical eth-rt3 ipv4 address 10.34.0.4/24
/ vrf main interface physical eth-rt3 port pci-b0s5
/ vrf main interface physical eth-rt8 ipv4 address 10.48.0.4/24
/ vrf main interface physical eth-rt8 port pci-b0s6
/ vrf main interface loopback loop1 ipv4 address 4.4.4.4/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt1 isis area-tag 1
/ vrf main routing interface eth-rt1 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt1 isis ipv4-routing true
/ vrf main routing interface eth-rt1 isis network-point-to-point true
/ vrf main routing interface eth-rt3 isis area-tag 1
/ vrf main routing interface eth-rt3 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt3 isis ipv4-routing true
/ vrf main routing interface eth-rt3 isis network-point-to-point true
/ vrf main routing interface eth-rt8 isis area-tag 1
/ vrf main routing interface eth-rt8 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt8 isis ipv4-routing true
/ vrf main routing interface eth-rt8 isis network-point-to-point true
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1004.00
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 4.4.4.4/32 sid-value 4
/ routing traffic-engineering affinity-map blue bit-position 0
/ routing traffic-engineering affinity-map red bit-position 1
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 4.4.4.4/32 sid-value 504
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 4.4.4.4/32 sid-value 404
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 4.4.4.4/32 sid-value 304
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 4.4.4.4/32 sid-value 204
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 4.4.4.4/32 sid-value 104
rt5
/ system hostname rt5
/ vrf main interface physical eth-rt0 ipv4 address 10.5.0.5/24
/ vrf main interface physical eth-rt0 port pci-b0s4
/ vrf main interface physical eth-rt1 ipv4 address 10.15.0.5/24
/ vrf main interface physical eth-rt1 port pci-b0s5
/ vrf main interface physical eth-rt6 ipv4 address 10.56.0.5/24
/ vrf main interface physical eth-rt6 port pci-b0s6
/ vrf main interface physical eth-rt8 ipv4 address 10.58.0.5/24
/ vrf main interface physical eth-rt8 port pci-b0s7
/ vrf main interface loopback loop1 ipv4 address 5.5.5.5/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt0 isis area-tag 1
/ vrf main routing interface eth-rt0 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt0 isis ipv4-routing true
/ vrf main routing interface eth-rt0 isis network-point-to-point true
/ vrf main routing interface eth-rt0 traffic-engineering metric 1000
/ vrf main routing interface eth-rt0 traffic-engineering delay average 150000 minimum 100000 maximum 200000
/ vrf main routing interface eth-rt1 isis area-tag 1
/ vrf main routing interface eth-rt1 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt1 isis ipv4-routing true
/ vrf main routing interface eth-rt1 isis network-point-to-point true
/ vrf main routing interface eth-rt6 isis area-tag 1
/ vrf main routing interface eth-rt6 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt6 isis ipv4-routing true
/ vrf main routing interface eth-rt6 isis network-point-to-point true
/ vrf main routing interface eth-rt8 isis area-tag 1
/ vrf main routing interface eth-rt8 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt8 isis ipv4-routing true
/ vrf main routing interface eth-rt8 isis network-point-to-point true
/ vrf main routing interface eth-rt8 traffic-engineering metric 100
/ vrf main routing interface eth-rt8 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1005.00
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 5.5.5.5/32 sid-value 5
/ routing traffic-engineering affinity-map blue bit-position 0
/ routing traffic-engineering affinity-map red bit-position 1
/ routing traffic-engineering affinity-map green bit-position 2
/ vrf main routing interface eth-rt0 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt6 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt6 traffic-engineering affinity-map red
/ vrf main routing interface eth-rt0 traffic-engineering affinity-map green
/ vrf main routing interface eth-rt6 traffic-engineering affinity-map green
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 5.5.5.5/32 sid-value 505
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 5.5.5.5/32 sid-value 405
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 5.5.5.5/32 sid-value 305
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 5.5.5.5/32 sid-value 205
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 5.5.5.5/32 sid-value 105
rt6
/ system hostname rt6
/ vrf main interface physical eth-rt2 ipv4 address 10.26.0.6/24
/ vrf main interface physical eth-rt2 port pci-b0s4
/ vrf main interface physical eth-rt5 ipv4 address 10.56.0.6/24
/ vrf main interface physical eth-rt5 port pci-b0s5
/ vrf main interface physical eth-rt7 ipv4 address 10.67.0.6/24
/ vrf main interface physical eth-rt7 port pci-b0s6
/ vrf main interface physical eth-rt9 ipv4 address 10.69.0.6/24
/ vrf main interface physical eth-rt9 port pci-b0s7
/ vrf main interface loopback loop1 ipv4 address 6.6.6.6/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt2 isis area-tag 1
/ vrf main routing interface eth-rt2 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt2 isis ipv4-routing true
/ vrf main routing interface eth-rt2 isis network-point-to-point true
/ vrf main routing interface eth-rt2 traffic-engineering metric 50
/ vrf main routing interface eth-rt2 traffic-engineering delay average 7500 minimum 5000 maximum 10000
/ vrf main routing interface eth-rt5 isis area-tag 1
/ vrf main routing interface eth-rt5 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt5 isis ipv4-routing true
/ vrf main routing interface eth-rt5 isis network-point-to-point true
/ vrf main routing interface eth-rt7 isis area-tag 1
/ vrf main routing interface eth-rt7 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt7 isis ipv4-routing true
/ vrf main routing interface eth-rt7 isis network-point-to-point true
/ vrf main routing interface eth-rt9 isis area-tag 1
/ vrf main routing interface eth-rt9 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt9 isis ipv4-routing true
/ vrf main routing interface eth-rt9 isis network-point-to-point true
/ vrf main routing interface eth-rt9 traffic-engineering metric 50
/ vrf main routing interface eth-rt9 traffic-engineering delay average 7500 minimum 5000 maximum 10000
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1006.00
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 6.6.6.6/32 sid-value 6
/ routing traffic-engineering affinity-map blue bit-position 0
/ routing traffic-engineering affinity-map red bit-position 1
/ routing traffic-engineering affinity-map green bit-position 2
/ vrf main routing interface eth-rt5 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt7 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt5 traffic-engineering affinity-map red
/ vrf main routing interface eth-rt9 traffic-engineering affinity-map red
/ vrf main routing interface eth-rt5 traffic-engineering affinity-map green
/ vrf main routing interface eth-rt7 traffic-engineering affinity-map green
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 6.6.6.6/32 sid-value 506
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 6.6.6.6/32 sid-value 406
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 6.6.6.6/32 sid-value 306
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 6.6.6.6/32 sid-value 206
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 6.6.6.6/32 sid-value 106
rt7
/ system hostname rt7
/ vrf main interface physical eth-rt3 ipv4 address 10.37.0.7/24
/ vrf main interface physical eth-rt3 port pci-b0s4
/ vrf main interface physical eth-rt6 ipv4 address 10.67.0.7/24
/ vrf main interface physical eth-rt6 port pci-b0s5
/ vrf main interface physical eth-rt8 ipv4 address 10.78.0.7/24
/ vrf main interface physical eth-rt8 port pci-b0s6
/ vrf main interface physical eth-rt9 ipv4 address 10.79.0.7/24
/ vrf main interface physical eth-rt9 port pci-b0s7
/ vrf main interface loopback loop1 ipv4 address 7.7.7.7/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt3 isis area-tag 1
/ vrf main routing interface eth-rt3 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt3 isis ipv4-routing true
/ vrf main routing interface eth-rt3 isis network-point-to-point true
/ vrf main routing interface eth-rt6 isis area-tag 1
/ vrf main routing interface eth-rt6 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt6 isis ipv4-routing true
/ vrf main routing interface eth-rt6 isis network-point-to-point true
/ vrf main routing interface eth-rt8 isis area-tag 1
/ vrf main routing interface eth-rt8 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt8 isis ipv4-routing true
/ vrf main routing interface eth-rt8 isis network-point-to-point true
/ vrf main routing interface eth-rt8 traffic-engineering metric 1000
/ vrf main routing interface eth-rt8 traffic-engineering delay average 150000 minimum 100000 maximum 200000
/ vrf main routing interface eth-rt9 isis area-tag 1
/ vrf main routing interface eth-rt9 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt9 isis ipv4-routing true
/ vrf main routing interface eth-rt9 isis network-point-to-point true
/ vrf main routing interface eth-rt9 traffic-engineering metric 1000
/ vrf main routing interface eth-rt9 traffic-engineering delay average 150000 minimum 100000 maximum 200000
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1007.00
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 7.7.7.7/32 sid-value 7
/ routing traffic-engineering affinity-map blue bit-position 0
/ routing traffic-engineering affinity-map green bit-position 2
/ vrf main routing interface eth-rt6 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt9 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt6 traffic-engineering affinity-map green
/ vrf main routing interface eth-rt9 traffic-engineering affinity-map green
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 7.7.7.7/32 sid-value 507
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 7.7.7.7/32 sid-value 407
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 7.7.7.7/32 sid-value 307
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 7.7.7.7/32 sid-value 207
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 7.7.7.7/32 sid-value 107
rt8
/ system hostname rt8
/ vrf main interface physical eth-rt4 ipv4 address 10.48.0.8/24
/ vrf main interface physical eth-rt4 port pci-b0s4
/ vrf main interface physical eth-rt5 ipv4 address 10.58.0.8/24
/ vrf main interface physical eth-rt5 port pci-b0s5
/ vrf main interface physical eth-rt7 ipv4 address 10.78.0.8/24
/ vrf main interface physical eth-rt7 port pci-b0s6
/ vrf main interface loopback loop1 ipv4 address 8.8.8.8/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt4 isis area-tag 1
/ vrf main routing interface eth-rt4 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt4 isis ipv4-routing true
/ vrf main routing interface eth-rt4 isis network-point-to-point true
/ vrf main routing interface eth-rt5 isis area-tag 1
/ vrf main routing interface eth-rt5 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt5 isis ipv4-routing true
/ vrf main routing interface eth-rt5 isis network-point-to-point true
/ vrf main routing interface eth-rt5 traffic-engineering metric 1000
/ vrf main routing interface eth-rt5 traffic-engineering delay average 150000 minimum 100000 maximum 200000
/ vrf main routing interface eth-rt7 isis area-tag 1
/ vrf main routing interface eth-rt7 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt7 isis ipv4-routing true
/ vrf main routing interface eth-rt7 isis network-point-to-point true
/ vrf main routing interface eth-rt7 traffic-engineering metric 1000
/ vrf main routing interface eth-rt7 traffic-engineering delay average 150000 minimum 100000 maximum 200000
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1008.00
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 8.8.8.8/32 sid-value 8
/ routing traffic-engineering affinity-map blue bit-position 0
/ routing traffic-engineering affinity-map green bit-position 2
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 8.8.8.8/32 sid-value 508
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 8.8.8.8/32 sid-value 408
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 8.8.8.8/32 sid-value 308
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 8.8.8.8/32 sid-value 208
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 8.8.8.8/32 sid-value 108
rt9
/ system hostname rt9
/ vrf main interface physical eth-rt3 ipv4 address 10.39.0.9/24
/ vrf main interface physical eth-rt3 port pci-b0s4
/ vrf main interface physical eth-rt6 ipv4 address 10.69.0.9/24
/ vrf main interface physical eth-rt6 port pci-b0s5
/ vrf main interface physical eth-rt7 ipv4 address 10.79.0.9/24
/ vrf main interface physical eth-rt7 port pci-b0s6
/ vrf main interface loopback loop1 ipv4 address 9.9.9.9/32
/ vrf main routing interface loop1 isis area-tag 1
/ vrf main routing interface loop1 isis ipv4-routing true
/ vrf main routing interface eth-rt3 isis area-tag 1
/ vrf main routing interface eth-rt3 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt3 isis ipv4-routing true
/ vrf main routing interface eth-rt3 isis network-point-to-point true
/ vrf main routing interface eth-rt3 traffic-engineering metric 100
/ vrf main routing interface eth-rt3 traffic-engineering delay average 15000 minimum 10000 maximum 20000
/ vrf main routing interface eth-rt6 isis area-tag 1
/ vrf main routing interface eth-rt6 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt6 isis ipv4-routing true
/ vrf main routing interface eth-rt6 isis network-point-to-point true
/ vrf main routing interface eth-rt6 traffic-engineering metric 50
/ vrf main routing interface eth-rt6 traffic-engineering delay average 7500 minimum 5000 maximum 10000
/ vrf main routing interface eth-rt7 isis area-tag 1
/ vrf main routing interface eth-rt7 isis fast-reroute ti-lfa level-1 enabled true
/ vrf main routing interface eth-rt7 isis ipv4-routing true
/ vrf main routing interface eth-rt7 isis network-point-to-point true
/ vrf main routing interface eth-rt7 traffic-engineering metric 1000
/ vrf main routing interface eth-rt7 traffic-engineering delay average 150000 minimum 100000 maximum 200000
/ vrf main routing isis instance 1 is-type level-1
/ vrf main routing isis instance 1 area-address 49.0000.0000.0000.1009.00
/ vrf main routing isis instance 1 segment-routing enabled true
/ vrf main routing isis instance 1 segment-routing label-blocks srgb lower-bound 20000
/ vrf main routing isis instance 1 segment-routing label-blocks srgb upper-bound 23000
/ vrf main routing isis instance 1 segment-routing msd node-msd 8
/ vrf main routing isis instance 1 segment-routing prefix-sid-map 9.9.9.9/32 sid-value 9
/ routing traffic-engineering affinity-map blue bit-position 0
/ routing traffic-engineering affinity-map red bit-position 1
/ routing traffic-engineering affinity-map green bit-position 2
/ vrf main routing interface eth-rt3 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt7 traffic-engineering affinity-map blue
/ vrf main routing interface eth-rt7 traffic-engineering affinity-map green
/ vrf main routing interface eth-rt6 traffic-engineering affinity-map red
/ vrf main routing isis instance 1 traffic-engineering
/ vrf main routing isis instance 1 flex-algorithm 132 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 131 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 130 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 129 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 128 dataplane sr-mpls
/ vrf main routing isis instance 1 flex-algorithm 132 segment-routing prefix-sid-map 9.9.9.9/32 sid-value 509
/ vrf main routing isis instance 1 flex-algorithm 131 segment-routing prefix-sid-map 9.9.9.9/32 sid-value 409
/ vrf main routing isis instance 1 flex-algorithm 130 segment-routing prefix-sid-map 9.9.9.9/32 sid-value 309
/ vrf main routing isis instance 1 flex-algorithm 129 segment-routing prefix-sid-map 9.9.9.9/32 sid-value 209
/ vrf main routing isis instance 1 flex-algorithm 128 segment-routing prefix-sid-map 9.9.9.9/32 sid-value 109
/ vrf main routing isis instance 1 flex-algorithm 132 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 132 definition metric-type delay
/ vrf main routing isis instance 1 flex-algorithm 132 definition prefix-metric false
/ vrf main routing isis instance 1 flex-algorithm 131 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 131 definition metric-type te
/ vrf main routing isis instance 1 flex-algorithm 131 definition prefix-metric false
/ vrf main routing isis instance 1 flex-algorithm 130 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 130 definition affinity include-any blue
/ vrf main routing isis instance 1 flex-algorithm 129 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 129 definition affinity exclude-any red
/ vrf main routing isis instance 1 flex-algorithm 128 definition advertise true
/ vrf main routing isis instance 1 flex-algorithm 128 definition affinity include-all blue
/ vrf main routing isis instance 1 flex-algorithm 128 definition affinity include-all green