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BFD
BFD is described and extended by the following RFCs: RFC 5880, RFC 5881 and RFC 5883.
In the age of very fast networks, a second of unreachability may equal millions of lost packets. The idea behind BFD is to detect very quickly when a peer is down and take action extremely fast.
BFD sends lots of small UDP packets very quickly to ensures that the peer is still alive.
This allows avoiding the timers defined in BGP and OSPF protocol to expires.
Configure BFD
Bind listener to specific interface/address, mandatory for IPv6
The minimal echo receive transmission interval that this system is capable of handling
Remote transmission interval will be multiplied by this value
For multi hop sessions only. Configure the minimum expected TTL for an incoming BFD control packet.
This feature serves the purpose of thightening the packet validation requirements to avoid receiving BFD control packets from other sessions.
Enable BFD in BGP
Enable BFD in OSPF
Enable BFD in ISIS
Operational Commands
Show all BFD peers
BFD Peers:
peer 198.51.100.33 vrf default interface eth4.100
ID: 4182341893
Remote ID: 12678929647
Status: up
Uptime: 1 month(s), 16 hour(s), 29 minute(s), 38 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: 0ms
peer 198.51.100.55 vrf default interface eth4.101
ID: 4618932327
Remote ID: 3312345688
Status: up
Uptime: 20 hour(s), 16 minute(s), 19 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: 0ms
BFD Static Route Monitoring
A monitored static route conditions the installation to the RIB on the BFD session running state: when BFD session is up the route is installed to RIB, but when the BFD session is down it is removed from the RIB.
Configuration
Configure a static route for <subnet> using gateway <address> and use the gateway address as BFD peer destination address.
Configure a static route for <subnet> using gateway <address> , use source address to indentify the peer when is multi-hop session and the gateway address as BFD peer destination address.
Configure a static route for <subnet> using gateway <address> and use the gateway address as BFD peer destination address.