Alcatel-Lucent 6850-48 Network Guide

Configuring BFD

Configuring BFD

page 30-22

OmniSwitch AOS Release 6 Network Configuration Guide

To disable BFD for all configured BGP neighbors, use the 

 with the no 

keyword, as shown below:

-> no ip bgp bfd-std all-neighbors

To display the BFD status of BGP neighbors, use the 

show ip bgp neighbors

 command. For example:

-> show ip bgp neighbors

Thereafter when there are any neighbors established to this interface, BGP informs the BFD-CMM about 
any newly added neighbor(s); BFD-CMM, in turn, informs the BFD-NI about the neighbor(s) and requests 
it to establish BFD sessions with them. You can use the 

 command to view BFD 

sessions with all BFD neighbors, as shown below:

-> show ip bfd-std sessions

Neighbor    Interface            Local  Remote  Negotiated  Negotiated Echo Rx

IP Address  Address       State  Disc   Disc     Tx          Rx 

-----------+------------+-------+------+------+------------+----------+----------

25.25.25.1   25.25.25.25  UP     45      53     100          100        200

26.26.26.63  26.26.26.36  INIT   43      21     200          200        200

Whenever there is any change to the neighbor/interface list or neighbor/interface state, BGP immediately 
informs BFD-CMM about the changes. Additionally, whenever BFD-NI detects any changes to the other 
end, it immediately informs BFD-CMM about the changes. BFD-CMM, then, updates its database accord-
ingly and informs BGP for its fastest convergence.

The steps below show you how to configure and verify BFD support for VRRP protocol, so that VRRP is 
a registered protocol with BFD and will receive forwarding path detection failure messages from BFD.

1 To encapsulate BFD within the VRRP protocol, you need to first register VRRP with BFD at the proto-
col level using the 

 command as shown below:

-> vrrp bfd-std enable

Note. The BFD status for VRRP protocol is disabled by default. Also, VRRP protocol supports BFD in the 
echo-only operational mode.

BFD status for VRRP protocol is now enabled which means that socket communication between VRRP 
and BFD is enabled. To de-register VRRP with BFD, enter the following command at the system prompt:

-> vrrp bfd-std disable

To verify the BFD status for VRRP protocol, you can use the show vrrp command as shown below:

-> show vrrp

Legends:Nbr = Neighbor 
As = Autonomous System 
 
Nbr Address    As  

Admin state   Oper state   BgpId    

Up/Down 

BFD Status 

-------------+---+-------------+-------------+-------------+------------+----------- 
192.40.4.29    3  

enabled  

established   192.40.4.29   00h:14m:48s  enabled 

192.40.4.121  

 5  

disabled  

idle    

0.0.0.0  

00h:00m:00s  disabled