BFD Configuration¶
There is a list of necessary elements to know when forging a BGP configuration.
Basic Elements For Configuring BFD Entry¶
When forging a BFD configuration, the destination
IP and the kind of
BFD variant determine a BFD session.
tracker bfd main type single-hop address 10.125.0.2 vrf main
Three additional parameters determine the BFD session: the source
address,
the interface
name and the vrf
name. The source
and interface
options
permit to stick with routing constraints.
tracker bfd other type single-hop address 10.125.0.2 source 10.125.0.1 vrf main
BFD provides low overhead. However, it provides a per peer custom configuration, that permits lowering (or increasing) the timers that determine how, and when BFD packets are sent, and received.
tracker bfd othername
type single-hop
address 10.125.0.2
vrf main
detection-multiplier 6
required-receive-interval 600000
desired-transmission-interval 600000
It is possible to disable bfd session usage, by using following command. Note that you will have to check that no other daemon is using BFD. Otherwise, the command will not be successful.
del tracker bfd othername
Basic Elements For General Configuration¶
It is possible to change general timer settings that will apply to the BFD sessions automatically created by routing protocols (like BGP). This facility avoids the heavy task to configure for each session the newly wished parameters. Note that configured values are expressed in microseconds.
routing bfd
detection-multiplier 7
required-receive-interval 800000
desired-transmission-interval 200000
Reversely, it is possible to revert to default settings. By default, detect multiplier is set to 3, while default required-receive-interval and transmit-interval is set to 300 milliseconds.
routing bfd
del detection-multiplier
del required-receive-interval
del desired-transmission-interval
Basic Elements For Monitoring¶
You can use the show bfd
commands to watch for BFD sessions.
Following commands gives detailed BFD information about the BFD sessions status and statistics.
vrouter> show bfd vrf main session single-hop destination 10.125.0.2
peer 10.125.0.2 singlehop local-address 10.125.0.1
ID: 2916604864
Remote ID: 1159562547
Status: up
Uptime: 37 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
vrouter> show bfd vrf main sessions counters
BFD Peers:
peer 10.125.0.2 singlehop local-address 10.125.0.1
Control packet input: 182 packets
Control packet output: 181 packets
Echo packet input: 0 packets
Echo packet output: 0 packets
Session up events: 1
Session down events: 0
Zebra notifications: 2
Configuration With Remote Daemons¶
In addition to be able to create BFD peer sessions by using nc-cli of bfd, it is possible to dynamically create BFD peer sessions by relying on remote daemons.
See also
Using BFD with BGP, see Configuring BGP with BFD.
Using BFD with OSPF, see Configuring OSPF with BFD.
Using OSPF v3 with BGP, see Configuring OSPFv3 with BFD.
Using BFD with static routes, see Configuring Static Routes with BFD.