BFD In OSPF¶
With BFD usage in OSPF, the failover mechanism is greatly improved by detecting
the loss of remote OSPF neighbors. Instead of relying on standard
BFD permits faster convergence.
To get more information on BFD, please see BFD.
BFD Configuration And Monitoring In OSPF¶
A BFD peer session context is created, along with discovering OSPF neighbors.
Due to the nature of OSPF, all created BFD peer contexts are
vrf customer1 routing ospf router-id 10.125.0.1 .. .. routing interface eth1_0 ip ospf area 0.0.0.1 ip ospf track bfd
Then you can continue the configuration as usual. For timer settings, the default emission and reception settings are set to 300000 microseconds, which may not be what is wished. In that case, it is possible to override default timers, by configuring general timer settings. More information is given in Configuring general BFD settings.
vrouter> show ospf vrf customer1 interface eth1_0 eth1_0 is up ifindex 2, MTU 1500 bytes, BW 10000 Mbit <UP,BROADCAST,RUNNING,MULTICAST> Internet Address 10.125.0.1/24, Broadcast 10.125.0.255, Area 0.0.0.1 MTU mismatch detection: enabled Router ID 10.125.0.1, Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State DR, Priority 1 Backup Designated Router (ID) 10.125.0.2, Interface Address 10.125.0.1 Multicast group memberships: OSPFAllRouters OSPFDesignatedRouters Timer intervals configured, Hello 10s, Dead 40s, Wait 40s, Retransmit 5 Hello due in 5.710s Neighbor Count is 1, Adjacent neighbor count is 1 BFD: Detect Multiplier: 3, Min Rx interval: 600, Min Tx interval: 600 vrouter> show ospf vrf customer1 neighbor Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL 10.125.0.2 1 Full/Backup 38.091s 10.125.0.2 eth1_0:10.125.0.1 0 0 0 vrouter> show ospf vrf customer1 database router 10.125.0.2 VRF Name: r2-cust1 OSPF Router with ID (10.254.254.2) Router Link States (Area 0.0.0.1) LS age: 70 Options: 0x2 : *|-|-|-|-|-|E|- LS Flags: 0x3 Flags: 0x2 : ASBR LS Type: router-LSA Link State ID: 10.125.0.2 Advertising Router: 10.125.0.2 LS Seq Number: 80000004 Checksum: 0xb65d Length: 36 Number of Links: 1 Link connected to: a Transit Network (Link ID) Designated Router address: 10.125.0.2 (Link Data) Router Interface address: 10.125.0.2 Number of TOS metrics: 0 TOS 0 Metric: 10 LS age: 70 Options: 0x2 : *|-|-|-|-|-|E|- LS Flags: 0x6 Flags: 0x2 : ASBR LS Type: router-LSA Link State ID: 10.125.0.2 Advertising Router: 10.125.0.2 LS Seq Number: 80000003 Checksum: 0x9a79 Length: 36 Number of Links: 1 Link connected to: a Transit Network (Link ID) Designated Router address: 10.0.3.1 (Link Data) Router Interface address: 10.0.3.1 Number of TOS metrics: 0 TOS 0 Metric: 10 vrouter> show bfd vrf customer1 session single-hop destination 10.125.0.2 BFD Peer: peer 10.125.0.2 interface eth1_0 ID: 322201613 Remote ID: 2746639856 Status: up Uptime: 9 minute(s), 49 second(s) Diagnostics: ok Remote diagnostics: ok Local timers: Receive interval: 300ms Transmission interval: 300ms Echo transmission interval: 50ms Remote timers: Receive interval: 300ms Transmission interval: 300ms Echo transmission interval: 50ms