Chapter 4 Implementing Bfd - Cisco ASR 9000 Series Routing Configuration Manual

Aggregation services router

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Implementing BFD

This module describes the configuration of bidirectional forwarding detection (BFD) on the Cisco ASR 9000

Series Router.

Bidirectional forwarding detection (BFD) provides low-overhead, short-duration detection of failures in the

path between adjacent forwarding engines. BFD allows a single mechanism to be used for failure detection

over any media and at any protocol layer, with a wide range of detection times and overhead. The fast

detection of failures provides immediate reaction to failure in the event of a failed link or neighbor.

Feature History for Implementing Bidirectional Forwarding Detection

Release 3.7.2

Release 3.9.0

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

C H A P T E R

Modification

BFD was introduced.

• Support for these applications with BFD was added:

◦ Hot Standby Router Protocol (HSRP)

◦ Virtual Router Redundancy Protocol (VRRP)

• The dampening command was added to minimize BFD session flapping

and delay session startup.

• The echo ipv4 source command was added to specify a source IP address

and override the default.

• The ipv6 checksum command was added to enable and disable the IPv6

UDP checksum computation and BFD interface configuration modes.

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