Dell S4048T-ON, Configuration Manual

Page: 173 / 1146

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 Te 4/25 Down 1000 1000 3 V
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
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, as shown in the example in Verifying BFD Sessions
with BGP Neighbors Using the
show bfd neighbors
command example in Displaying BFD for BGP Information .
Disabling BFD for VRRP
If you disable any or all VRRP sessions, the sessions are torn down.
A final Admin Down control packet is sent to all neighbors and sessions on the remote system change to the Down state.
Bidirectional Forwarding Detection (BFD) 173