Disabling Echo Mode; Disabling Echo Mode On A Router - Cisco ASR 9000 Series Configuration Manual

Implementing BFD
Command or Action
Step 4
commit

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
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
OL-30423-03
links that span multiple racks.
BFD echo mode is automatically disabled for BFD on physical interfaces when the
Note
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).
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
Purpose
• The local router is capable of running echo (echo is enabled for this
session).
• The remote router is capable of running echo (received control packet
from remote system has non-zero "Required Min Echo RX Interval"
value).
When the force keyword is configured, the local system performs echo
startup validation if following conditions are true.
• The local router is capable of running echo (echo is enabled for this
session).
• The remote router echo capability is not considered (received control
packet from remote system has zero or non-zero "Required Min Echo
RX Interval" value).
Disabling Echo Mode
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