Overriding The Default Echo Packet Source Address; Specifying The Echo Packet Source Address Globally For Bfd - Cisco ASR 9000 Series Routing Configuration Manual

Implementing BFD

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.
In Cisco IOS XR releases before 3.9.0, we recommend that you configure the local router ID using the
router-id command to change the default IP address for the echo packet source address to the adrdress specified
as the router ID.
Beginning in Cisco IOS XR release 3.9.0 and later, 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/RSP0/CPU0:router(config)# bfd
Step 3
echo ipv4 source ip-address
Example:
RP/0/RSP0/CPU0:router(config-bfd)# echo ipv4
source 10.10.10.1
Step 4 commit
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
Overriding the Default Echo Packet Source Address
Purpose
Enters BFD configuration mode.
Specifies an IPv4 address to be used as the source address
in BFD echo packets, where ip-address is the 32-bit IP
address in dotted-decimal format (A.B.C.D).
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