Administrator Guide

Establishing VRRP Sessions on VRRP Neighbors
The master router does not care about the state of the backup router, so it does not participate in any VRRP BFD sessions.
VRRP BFD sessions on the backup router cannot change to the UP state. Configure the master router to establish an individual VRRP
session the backup router.
To establish a session with a particular VRRP neighbor, use the following command.
• Establish a session with a particular VRRP neighbor.
INTERFACE mode
vrrp bfd neighbor ip-address
To view the established sessions, use the show bfd neighbors command.
The bold line shows that VRRP BFD sessions are enabled.
DellEMC(conf-if-te-1/1/1/1)#vrrp bfd all-neighbors
DellEMC(conf-if-te-1/1/1/1)#do show bfd neighbor
* - Active session role
Ad Dn - Admin Down
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
V - VRRP
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 2.2.5.1 2.2.5.2 Te 1/1/1/1 Down 1000 1000 3 V
To view session state information, use the show vrrp command.
The bold line shows the VRRP BFD session.
DellEMC(conf-if-te-1/1/1/1)#do show vrrp
------------------
TenGigabitEthernet 1/1/2/1, VRID: 1, Net: 2.2.5.1
VRF:0 default
State: Backup, Priority: 1, Master: 2.2.5.2
Hold Down: 0 sec, Preempt: TRUE, AdvInt: 1 sec
Adv rcvd: 95, Bad pkts rcvd: 0, Adv sent: 933, Gratuitous ARP sent: 3
Virtual MAC address:
00:00:5e:00:01:01
Virtual IP address:
2.2.5.4
Authentication: (none)
BFD Neighbors:
RemoteAddr State
2.2.5.2 Up
Changing VRRP Session Parameters
BFD sessions are configured with default intervals and a default role.
The parameters that you can configure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role. You can
change parameters for all VRRP sessions or for a particular neighbor.
To change parameters for all VRRP sessions or for a particular VRRP session, use the following commands.
• Change parameters for all VRRP sessions.
INTERFACE mode
vrrp bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value role
[active | passive]
• Change parameters for a particular VRRP session.
INTERFACE mode
vrrp bfd neighbor ip-address interval milliseconds min_rx milliseconds multiplier value role
[active | passive]
To view session parameters, use the show bfd neighbors detail command.
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Bidirectional Forwarding Detection (BFD)