Concept Guide

Example Configuration and Verification
The following example contains static routes for both default and nondefault VRFs.
Dell#sh run | grep bfd
bfd enable
ip route bfd prefix-list p4_le
ip route bfd vrf vrf1
ip route bfd vrf vrf2
ip route bfd vrf vrf1 prefix-list p4_le
The following example shows that sessions are created for static routes for the default VRF.
Dell#show bfd neighbors
* - Active session role
Ad Dn - Admin Down
B - BGP
C - CLI
I - ISIS
O - OSPF
O3 - OSPFv3
R - Static Route (RTM)
M - MPLS
V - VRRP
VT - Vxlan Tunnel
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 11.1.1.1 11.1.1.2 Gi 1/1 Up 200 200 3 R
* 21.1.1.1 21.1.1.2 Vl 100 Up 200 200 3 R
* 31.1.1.1 31.1.1.2 Vl 101 Up 200 200 3 R
The following example shows that sessions are created for static routes for the nondefault VRFs.
Establishing Static Route Sessions on Specific Neighbors
You can selectively enable BFD sessions on specific neighbors based on a destination prefix-list.
When you establish a BFD session using the ip route bfd command, all the next-hop neighbors in the static route become
part of the BFD session. Starting with Dell EMC Networking OS release 9.11.0.0, you can enable BFD sessions on specific
next-hop neighbors. You can specify the next-hop neighbors to be part of a BFD session by including them in a prefix-list.
Prefix lists are used in route maps and route filtering operations. You can use prefix lists as an alternative to existing access lists
(ACLs). A prefix is a portion of the IP address. Prefix lists constitute any number of bits in an IP address starting from the far
left bit of the far left octet. By specifying the exactly number of bits in an IP address that belong to a prefix list, the prefix list
can be used to aggregate addresses and perform some functions; for example, redistribution.
You can use the following options to enable or disable the BFD session:
● Permit – The permit option enables creation of a BFD session on the specified prefix list or prefix list range. The no permit
option enables tear down of the BFD session if and only if the ACL has no permit entry that shares the same neighbor.
● Deny – The deny option prevents BFD sessions from getting created for the specified prefix list or prefix list range.
For more information on prefix lists, see IP Prefix Lists.
To enable BFD sessions on specific neighbors, perform the following steps:
Enter the following command to enable BFD session on specific next-hop neighbors:
CONFIGURATION
ip route bfd prefix-list prefix-list-name
The BFD session is established for the next-hop neighbors that are specified in the prefix-list.
● The absence of a prefix-list causes BFD sessions to be enabled on all the eligible next-hop neighbors.
● You can use only valid unicast address prefixes in the BFD prefix list. An erroneous prefix in a prefix-list causes the entire
prefix-list to be rejected.
● A BFD session is enabled for the directly connected next-hop neighbor specified in the configured destination prefix list.
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Bidirectional Forwarding Detection (BFD)