BFD Next Hop Verification Configuration Example

To enable BFD next hop verification between two adjacent peers, you configure each peer as follows:

1. Configure peer A with the next hop address of peer B along with the desired intervals and keyword options.

   host1(config)#ip route 192.1.1.0 255.255.255.0 192.1.2.1 verify bfd-liveness-detection minimum-interval 500 multiplier 3 last-resort
   

2. Configure peer B with the next hop address of peer A along with the desired intervals and keyword options.

   host1(config)#ip route 192.1.2.1 255.255.255.0 192.1.1.0 verify bfd-liveness-detection minimum-interval 300 multiplier 3

ip route verify bfd-liveness-detection

• Use to enable BFD on a static route.
• Use the minimum-interval keyword to specify a value in the range 100–65535 milliseconds. This keyword defines both the minimum receive interval and minimum transmit interval using the same value.
• Use the minimum-receive-interval keyword to specify a minimum receive interval value in the range 100–65535 milliseconds.
• Use the minimum-transmit-interval keyword to specify a minimum transmit interval value in the range 100–65535 milliseconds.
• Use the multiplier keyword to specify a multiplier number in the range 1–255.
• Optionally, you can include the last-resort keyword when you use the verify bfd-liveness-detection keywords to instruct the router to install the static route in the routing table even if the specified BFD operation is currently unreachable, provided that no other static route to the same network prefix is available.
• Change parameters at any time without stopping or restarting the existing session; BFD automatically adjusts to the new parameter value. However, no changes to BFD parameters take place until the values resynchronize with each BFD peer.
• Example 1—Next hop address and last resort

  host1(config)#ip route 192.56.15.23 255.255.255.0 192.66.0.1 verify bfd-liveness-detection minimum-interval 800 multiplier 2 last-resort

• Example 2—Next hop address and interface

  host1(config)#ip route 192.56.15.24 255.255.255.0 192.66.0.2 fast 6/0 verify bfd-liveness-detection

• Example 3—Next hop address with different receive and transmit intervals

  host1(config)#ip route 192.56.15.23 255.255.255.0 192.66.0.1 verify bfd-liveness-detection minimum-receive-interval 800 minimum-transmit-interval 300 multiplier 2 last-resort

• Use the no version to remove the static route from the routing table and thereby remove BFD from that static route.
• See ip route

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