Cisco ASR 9000 Series Routing Configuration Guide

SUMMARY STEPS
1.
configure
2.
bfd
3.
echo startup validate [force]
4.
commit
DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Enters BFD configuration mode.bfd
Example:
RP/0/0RP0RSP0/CPU0:router(config)# bfd
Step 2
Enables verification of the echo packet path before starting a BFD session,
where an echo packet is periodically transmitted on the link to verify
echo startup validate [force]
Example:
RP/0/0RP0RSP0/CPU0:router(config-bfd)#
echo startup validate
Step 3
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
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).
commit
Step 4
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
274
Implementing BFD
Disabling Echo Mode

Cisco ASR 9000 Series Specifications

General

Series	ASR 9000
Category	Network Router
Modular Design	Yes
Redundancy	Yes (Hardware and Software)
Operating System	Cisco IOS XR
Interfaces/Ports	10G, 40G, 100G, 400G Ethernet
Expansion Slots	Varies by model
Routing Protocol	BGP, OSPF, IS-IS, EIGRP
Management	CLI, SNMP, NETCONF
Power Supply	Redundant
Port Density	Varies by model
Power Supply Options	AC, DC
Memory	Varies by model
Storage	Varies by model
Dimensions	Varies by model
Weight	Varies by model