Cisco A9K-SIP-700 Configuration Guide

Support for BFD Hardware Offload was added.Release 5.1.2
Support for BFD over Bundles CISCO/IETF mode support on a per bundle
basis was added.
Release 5.2.4
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Prerequisites for Implementing BFD, page 175
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Restrictions for Implementing BFD, page 176
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Information About BFD, page 177
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How to Configure BFD, page 196
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Configuration Examples for Configuring BFD, page 229
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Where to Go Next, page 236
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Additional References, page 236
Prerequisites for Implementing BFD
You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command. If you suspect user group assignment is
preventing you from using a command, contact your AAA administrator for assistance.
The following prerequisites are required to implement BFD:
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If enabling BFD on Multiprotocol Label Switching (MPLS), an installed composite PIE file including
the MPLS package, or a composite-package image is required. For Border Gateway Protocol (BGP),
Intermediate System-to-Intermediate System (IS-IS), Static, and Open Shortest Path First (OSPF), an
installed Cisco IOS XR IP Unicast Routing Core Bundle image is required.
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Interior Gateway Protocol (IGP) is activated on the router if you are using IS-IS or OSPF.
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On the Cisco ASR 9000 Series Router, each line card supporting BFD must be able to perform the
following tasks:
◦
Send echo packets every 50ms * 3 (as a minimum under normal conditions)
◦
Send control packets every 150ms * 3 (as a minimum under stress conditions)
◦
Send and receive up to 9600 User Datagram Protocol (UDP) pps. This sustains 144 sessions at a
15-ms echo interval (or 1440 sessions at a 150-ms echo interval).
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To enable BFD for a neighbor, the neighbor router must support BFD.
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In Cisco IOS XR releases before Release 3.9.0, we recommended that you configure the local router ID
with the router-id command in global configuration mode prior to setting up a BFD session. If you did
not configure the local router ID, then by default the source address of the IP packet for BFD echo mode
is the IP address of the output interface. Beginning in Cisco IOS XR release 3.9.0 and later, you can use
the echo ipv4 source command to specify the IP address that you want to use as the source address.
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To support BFD on bundle member links, be sure that the following requirements are met:
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
OL-30423-03 175
Implementing BFD
Prerequisites for Implementing BFD

Cisco A9K-SIP-700 Specifications

General

Brand	Cisco
Model	A9K-SIP-700
Category	Network Router
Language	English