DETAILED STEPS
SUMMARY STEPS
1.
configure
2.
bfd
3.
echo latency detect [percentage percent-value [count packet-count]
4.
commit
DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Enters BFD configuration mode.bfd
Example:
RP/0/RSP0/CPU0:router(config)# bfd
Step 2
Enables echo packet latency detection over the course of a BFD
session, where:
echo latency detect [percentage percent-value
[count packet-count]
Step 3
Example:
RP/0/RSP0/CPU0:router(config-bfd)# echo
latency detect
• percentage percent-value—Specifies the percentage of the
echo failure detection time to be detected as bad latency. The
range is 100 to 250. The default is 100.
• count packet-count—Specifies a number of consecutive packets
received with bad latency that will take down a BFD session.
The range is 1 to 10. The default is 1.
commit
Step 4
Delaying BFD Session Startup Until Verification of Echo Path and Latency
Beginning in Cisco IOS XR Release 4.0.1, you can verify that the echo packet path is working and within
configured latency thresholds before starting a BFD session on non-bundle interfaces.
Echo startup validation is not supported on bundle interfaces.Note
To configure BFD echo startup validation, complete the following steps.
Before You Begin
Before you enable echo startup validation, be sure that your BFD configuration supports echo mode.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
273
Implementing BFD
Delaying BFD Session Startup Until Verification of Echo Path and Latency
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