Disabling Echo Mode - Cisco ASR 9000 Series Routing Configuration Manual

Aggregation services router

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Disabling Echo Mode

SUMMARY STEPS

1. configure

3. echo startup validate [force]

DETAILED STEPS

Command or Action

RP/0/0RP0RSP0/CPU0:router(config)# bfd

echo startup validate [force]

RP/0/0RP0RSP0/CPU0:router(config-bfd)#

echo startup validate

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:

Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x

Enters BFD configuration mode.

Enables verification of the echo packet path before starting a BFD session,

where an echo packet is periodically transmitted on the link to verify

successful transmission within the configured latency before allowing the

BFD session to change state.

When the force keyword is not configured, the local system performs echo

startup validation if the following conditions are true:

• The local router is capable of running echo (echo is enabled for this

• The remote router is capable of running echo (received control packet

from remote system has non-zero "Required Min Echo RX Interval"

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

• 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).

Implementing BFD

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