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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To enable BFD for a neighbor, the neighbor router must support BFD.
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To support BFD on bundle member links, be sure that the following requirements are met:
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The routers on either end of the bundle are connected back-to-back without a Layer 2 switch in between.
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For a BFD session to start, any one of the following configurations or states are present on the bundle member:
Link Aggregation Control Protocol (LACP) Distributing state is reached, –Or–
EtherChannel is configured.
Hot Standby and LACP Collecting state is reached.
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