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Configuring BFD
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m
Command
Step 4
bfd interval mintx min_rx msec
multiplier value
Example:
switch(config-if)# bfd interval 50
min_rx 50 multiplier 3
Step 5
bfd authentication keyed-sha1 keyid id
key ascii_key
Example:
switch(config-if)# bfd authentication
keyed-sha1 keyid 1 ascii_key cisco123
Step 6
show running-config bfd
Example:
switch(config-if)# show running-config
bfd
Step 7
copy running-config startup-config
Example:
switch(config-if)# copy running-config
startup-config
Configuring BFD Echo Function
You can configure the BFD echo function on one or both ends of a BFD-monitored link. The echo
function slows down the required minimum receive interval, based on the configured slow timer. The
RequiredMinEchoRx BFD session parameter is set to zero if the echo function is disabled. The slow
timer becomes the required minimum receive interval if the echo function is enabled.
BEFORE YOU BEGIN
Ensure that you are in the correct VDC (or use the switchto vdc command).
Enable the BFD feature. See the
Configure the BFD session parameters. See the
page 5-8
Ensure that Internet Control Message Protocol (ICMP) redirect messages are disabled on BFD-enabled
interfaces. Use the no ip redirects command on the interface.
Ensure that the IP packet verification check for identical IP source and destination addresses is disabled.
Use the no hardware ip verify address identical command in the default VDC. See the Cisco Nexus
7000 Series NX-OS Unicast Routing Configuration Guide, Release 5.x, for more information on this
command.
SUMMARY STEPS
1.
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
5-12
or the
"Configuring BFD on an Interface" section on page
configure terminal
Chapter 5
Purpose
(Optional) Configures the BFD session parameters for
all BFD sessions on the port channel. 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.
(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.
(Optional) Displays the BFD running configuration.
(Optional) Saves this configuration change.
"Enabling the BFD Feature" section on page
"Configuring Global BFD Parameters" section on
Configuring Bidirectional Forwarding Detection
5-7.
5-9.
OL-23435-03
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