Prerequisites For Implementing Bfd - Cisco ASR 9000 Series Routing Configuration Manual

Implementing BFD
Release 5.3.1
Release 6.2.1
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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:
• If enabling BFD on Multiprotocol Label Switching (MPLS), an installed composite PIE file including
• Interior Gateway Protocol (IGP) is activated on the router if you are using IS-IS or OSPF.
• On the Cisco ASR 9000 Series Router, each line card supporting BFD must be able to perform the
• To enable BFD for a neighbor, the neighbor router must support BFD.
• In Cisco IOS XR releases before Release 3.9.0, we recommended that you configure the local router ID
• To support BFD on bundle member links, be sure that the following requirements are met:
Support for BFD over Bundles CISCO/IETF mode support on a per bundle
basis was added.
Support for BFD HW Offload on bundle-ether interfaces with aggressive timers
was added.
Prerequisites for Implementing BFD, page 231
Restrictions for Implementing BFD, page 232
Information About BFD, page 233
How to Configure BFD, page 254
Configuration Examples for Configuring BFD, page 290
Where to Go Next, page 297
Additional References, page 298
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.
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).
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.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
Prerequisites for Implementing BFD
231