Dell S4820T Configuration Manual page 181

The bold line shows that VRRP BFD sessions are enabled.
Dell(conf-if-te-4/25)#vrrp bfd all-neighbors
Dell(conf-if-te-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
To view session state information, use the show vrrp command.
The bold line shows the VRRP BFD session.
Dell(conf-if-te-4/25)#do show vrrp
------------------
TenGigabitEthernet 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
Dell(conf-if-te-4/25/1)#do show vrrp
------------------
TenGigabitEthernet 4/1/1, 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
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
Bidirectional Forwarding Detection (BFD)
Te 4/25 Down 1000 1000 3 V
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