Cisco N7K-C7010 Configuration Guide - Page 140

Configuring BFD Chapter 5 Configuring Bidirectional Forwarding Detection Send document comments to [email protected] Step 4 Command 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 Step 7 Example: switch(config-if)# show running-config bfd copy running-config startup-config Example: switch(config-if)# copy running-config startup-config 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. 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 "Enabling the BFD Feature" section on page 5-7. Configure the BFD session parameters. See the "Configuring Global BFD Parameters" section on page 5-8 or the "Configuring BFD on an Interface" section on page 5-9. 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. configure terminal 5-12 Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x OL-23435-03