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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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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

Example of Viewing Sessions with VRRP Neighbors

To view the established sessions, use the show bfd neighbors command.

The bold line shows that VRRP BFD sessions are enabled. 

R1(conf-if-gi-4/25)#vrrp bfd all-neighbors
                                 R1(conf-if-gi-4/25)#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     Gi 4/25  Down  200   200   3    V

To view session state information, use the show vrrp command.

The bold line shows the VRRP BFD session. 

R1(conf-if-gi-4/25)#do show vrrp
                                 ------------------
                                 GigabitEthernet 4/1, VRID: 1, Net: 2.2.5.1
                                 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

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