bfd echo
To enable Bidirectional Forwarding Detection (BFD) echo mode, use the bfd echo command in interface
configuration mode. To disable BFD echo mode, use the no form of this command
bfd echo
no bfd echo
Syntax Description
This command has no arguments or keywords.
Command Default
BFD echo mode is enabled by default if BFD is configured using bfd interval command in interface
configuration mode.
Command Modes
Interface configuration (config-if)
Command History
ModificationRelease
This command was introduced.Cisco IOS XE Denali 16.3.1
Usage Guidelines
Echo mode is enabled by default. Entering the no bfd echo command without any keywords turns off the
sending of echo packets and signifies that the switch is unwilling to forward echo packets received from BFD
neighbor switches.
When echo mode is enabled, the desired minimum echo transmit interval and required minimum transmit
interval values are taken from the bfd interval milliseconds min_rx milliseconds parameters, respectively.
Before using BFD echo mode, you must disable sending Internet Control Message Protocol (ICMP)
redirect messages by entering the no ip redirects command, in order to avoid high CPU utilization.
Note
Examples
The following example configures echo mode between BFD neighbors:
Device> enable
Device# configuration terminal
Device(config)# interface GigabitEthernet 1/0/3
Device(config-if)# bfd echo
The following output from the show bfd neighbors details command shows that the BFD session neighbor
is up and using BFD echo mode. The relevant command output is shown in bold in the output.
Device# show bfd neighbors details
OurAddr NeighAddr LD/RD RH/RS Holdown(mult) State Int
172.16.1.2 172.16.1.1 1/6 Up 0 (3 ) Up Fa0/1
Session state is UP and using echo function with 100 ms interval.
Local Diag: 0, Demand mode: 0, Poll bit: 0
MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
689
bfd echo
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