Procedure
-
Enable BFD support with the command
bfd.
-
Enable BFD on a VRRP interface with the command
bfd
<IPV4-ADDR>.
-
For most deployments, the default values for the following features do not need to be changed. If your deployment requires different settings, change the default values with the indicated command:
| BFD setting
|
Default value
|
Command to change it
|
|---|
| Sets the BFD detection multiplier on an interface.
|
5
|
bfd detect-multiplier |
| Sets the minimum time interval between received BFD echo packets.
|
500 milliseconds
|
bfd min-echo-receive-interval |
| Sets the minimum time interval between transmitted BFD control packets on an interface.
|
3000 milliseconds
|
bfd min-transmit-interval |
Configuring the timers to be too aggressive (for example, detect-multiplier of 1) can sometimes lead to BFD session flaps depending upon traffic conditions.
-
Review BFD configuration settings with the commands
show bfd.
Example
Enabling BFD on a VRRP interface.
switch# config
switch(config)# bfd
switch# interface 1/1/1
switch(config-if)# no shutdown
switch(config-if)# ip address 192.168.1.1/24
switch(config-if)# vrrp 1 address-family ipv4
switch(config-if-vrrp)# bfd 192.158.1.2
switch(config-if-vrrp)# exit
switch# show vrrp
VRRP is enabled
Interface 1/1/1 - Group 1 - Address-Family IPv4
State is MASTER
State duration 56 mins 57.826 secs
Virtual IP address is 192.168.1.1
Virtual MAC address is 00:00:5e:00:01:01
Advertisement interval is 1000 msec
Preemption enabled
Priority is 100
BFD is enabled
Master Router is 192.168.1.1 (local), priority is 100
Master Advertisement interval is 1000 msec
Master Down interval is unknown
Tracked object ID is 1, and state Down