Enabling Echo Mode To Test The Forwarding Path To A Bfd Peer; Overriding The Default Echo Packet Source Address; Specifying The Echo Packet Source Address Globally For Bfd - Cisco NCS 6000 Series Configuration Manual

Enabling Echo Mode to Test the Forwarding Path to a BFD Peer

Enabling Echo Mode to Test the Forwarding Path to a BFD Peer
BFD echo mode is enabled by default for the following interfaces:
• For IPv4 on member links of BFD bundle interfaces.
• For IPv4 on other physical interfaces whose minimum interval is less than two seconds.

Overriding the Default Echo Packet Source Address

If you do not specify an echo packet source address, then BFD uses the IP address of the output interface as
the default source address for an echo packet.
You can use the echo ipv4 source command in BFD or interface BFD configuration mode to specify the IP
address that you want to use as the echo packet source address.
You can override the default IP source address for echo packets for BFD on the entire router, or for a particular
interface.

Specifying the Echo Packet Source Address Globally for BFD

To specify the echo packet source IP address globally for BFD on the router, complete the following steps:
SUMMARY STEPS
1. configure
2. bfd
3. echo ipv4 source ip-address
4. commit
DETAILED STEPS
Command or Action
Step 1
configure
Step 2
bfd
Example:
RP/0/RP0/CPU0:router(config)# bfd
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
152
Note
If you have configured a BFD minimum interval greater than two seconds on a
physical interface using the bfd minimum-interval command, then you will
need to change the interval to be less than two seconds to support and enable
echo mode. This does not apply to bundle member links, which always support
echo mode.
Purpose
Enters BFD configuration mode.
Implementing BFD