Cisco ASR 9000 Series Configuration Guide

Echo Latency Detection: Examples
In the following examples, consider that the BFD minimum interval is 50 ms, and the multiplier is 3 for the
BFD session.
The following example shows how to enable echo latency detection using the default values of 100% of the
echo failure period (I x M) for a packet count of 1. In this example, when one echo packet is detected with a
roundtrip delay greater than 150 ms, the session is taken down:
RP/0/RSP0/CPU0:router#configure
RP/0/RSP0/CPU0:router(config)#bfd
RP/0/RSP0/CPU0:router(config-bfd)#echo latency detect
The following example shows how to enable echo latency detection based on 200% (two times) of the echo
failure period for a packet count of 1. In this example, when one packet is detected with a roundtrip delay
greater than 300 ms, the session is taken down:
RP/0/RSP0/CPU0:router#configure
RP/0/RSP0/CPU0:router(config)#bfd
RP/0/RSP0/CPU0:router(config-bfd)#echo latency detect percentage 200
The following example shows how to enable echo latency detection based on 100% of the echo failure period
for a packet count of 3. In this example, when three consecutive echo packets are detected with a roundtrip
delay greater than 150 ms, the session is taken down:
RP/0/RSP0/CPU0:router#configure
RP/0/RSP0/CPU0:router(config)#bfd
RP/0/RSP0/CPU0:router(config-bfd)#echo latency detect percentage 100 count 3
Echo Startup Validation: Examples
The following example shows how to enable echo startup validation for BFD sessions on non-bundle interfaces
if the last received control packet contains a non-zero “Required Min Echo RX Interval” value:
RP/0/RSP0/CPU0:router#configure
RP/0/RSP0/CPU0:router(config)#bfd
RP/0/RSP0/CPU0:router(config-bfd)#echo startup validate
The following example shows how to enable echo startup validation for BFD sessions on non-bundle interfaces
regardless of the “Required Min Echo RX Interval” value in the last control packet:
RP/0/RSP0/CPU0:router#configure
RP/0/RSP0/CPU0:router(config)#bfd
RP/0/RSP0/CPU0:router(config-bfd)#echo startup validate force
BFD Echo Mode Disable: Examples
The following example shows how to disable echo mode on a router:
RP/0/RSP0/CPU0:router#configure
RP/0/RSP0/CPU0:router(config)#bfd
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
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Implementing BFD
Echo Latency Detection: Examples

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English