Administrator Guide

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.
Dell# show bfd vrf vrf2 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 VRF Clients
* 13.1.1.1 13.1.1.2 Gi 1/2 Up 200 200 3 2 R
* 23.1.1.1 23.1.1.2 Vl 300 Up 200 200 3 2 R
* 33.1.1.1 33.1.1.2 Vl 301 Up 200 200 3 2 R
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.
Bidirectional Forwarding Detection (BFD)
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