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ip route verify bfd-liveness-detection
Copyright © 2010, Juniper Networks, Inc.
You configure the static routes with the actual next hop address and not just interface
details.
The BFD protocol is operational on both ends of the verification.
The next hop is adjacent to the router (that is, only one hop away).
NOTE: BFD next-hop verification does not currently function in a multi-hop
configuration.
The next hop to the specified IP destination address is resolved.
You can further control the installation of static routes by specifying the last-resort
keyword, which is valid when you use the bfd-liveness-detection keywords in the ip
route command. The last-resort keyword instructs the router to install the static route
in the routing table even if the specified BFD operation is unreachable, provided that no
other static route to the same network prefix is available.
The static route is removed from the routing table if the next hop is no longer reachable
and reinstalled when the route becomes reachable again.
BFD Next Hop Verification Configuration Example
To enable BFD next hop verification between two adjacent peers, you configure each
peer as follows:
Configure peer A with the next hop address of peer B along with the desired intervals
1.
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
Configure peer B with the next hop address of peer A along with the desired intervals
2.
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
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
Chapter 1: Configuring IP
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