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5-10
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 5 Configuring Bidirectional Forwarding Detection
Configuring BFD
SUMMARY STEPS
1. configure terminal
2. interface int-if
3. bfd interval mintx min_rx msec multiplier value
4. (Optional) bfd authentication keyed-sha1 keyid id key ascii_key
5. (Optional) show running-config bfd
6. (Optional) copy running-config startup-config
DETAILED STEPS
Command Purpose
Step 1
configure terminal
Example:
switch# configure terminal
switch(config)#
Enters configuration mode.
Step 2
interface int-if
Example:
switch(config)# interface ethernet 2/1
switch(config-if)#
Enters interface configuration mode. Use the ?
keyword to display the supported interfaces.
Step 3
bfd interval mintx min_rx msec
multiplier value
Example:
switch(config-if)# bfd interval 50
min_rx 50 multiplier 3
Configures the BFD session parameters for all BFD
sessions on the interface. This overrides the global
BFD session parameters. The mintx and msec range is
from 50 to 999 milliseconds and the default is 50. The
multiplier range is from 1 to 50. The multiplier default
is 3.
Step 4
bfd authentication keyed-sha1 keyid id
key ascii_key
Example:
switch(config-if)# bfd authentication
keyed-sha1 keyid 1 ascii_key cisco123
(Optional) Configures SHA-1 authentication for all
BFD sessions on the interface. The ascii_key string is
a secret key shared among BFD peers. The id value, a
number between 0 and 255, is assigned to this
particular ascii_key. BFD packets specify the key by
id, allowing the use of multiple active keys.
To disable SHA-1 authentication on the interface, use
the no form of the command.
Step 5
show running-config bfd
Example:
switch(config-if)# show running-config
bfd
(Optional) Displays the BFD running configuration.
Step 6
copy running-config startup-config
Example:
switch(config-if)# copy running-config
startup-config
(Optional) Saves this configuration change.
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