Disabling Echo Mode
BFD does not support asynchronous operation in echo mode in certain environments. Echo mode should be
disabled when using BFD for the following applications or conditions:
• BFD with uRPF (IPv4)
• To support rack reload and online insertion and removal (OIR) when a BFD bundle interface has member
links that span multiple racks.
BFD echo mode is automatically disabled for BFD on physical interfaces when
the minimum interval is greater than two seconds. The minimum interval does
not affect echo mode on BFD bundle member links. BFD echo mode is also
automatically disabled for BFD on bundled VLANs and IPv6 (global and link-local
addressing).
Note
You can disable echo mode for BFD on the entire router, or for a particular interface.
Disabling Echo Mode on a Router
To disable echo mode globally on the router complete the following steps:
DETAILED STEPS
SUMMARY STEPS
1. configure
2. bfd
3. echo disable
4. commit
DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Enters BFD configuration mode.bfd
Example:
Step 2
RP/0/RP0/CPU0:router(config)# bfd
Disables echo mode on the router.echo disable
Example:
Step 3
RP/0/RP0/CPU0:router(config-bfd)# echo disable
commit
Step 4
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
156
Implementing BFD
Disabling Echo Mode
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