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29-1
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
29
Configuring Multihop Bidirectional Forwarding
Detection
Cisco ASR 901 supports Bidirectional Forwarding Detection(BFD) on arbitrary paths, which can span
multiple network hops. The multihop BFD feature provides subsecond forwarding failure detection for
a destination with more than one hop and up to 255 hops. A multihop BFD session is set up between a
unique source-destination address pair provided by the client. A session can be set up between two
endpoints that have IP connectivity.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature
information and caveats, see the release notes for your platform and software release. To find information
about the features documented in this module, and to see a list of the releases in which each feature is
supported, see the “Feature Information for Multihop BFD” section on page 29-7.
Use Cisco Feature Navigator to find information about platform support and Cisco software image
support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on
Cisco.com is not required.
Contents
• Restrictions for Multihop BFD, page 29-2
• Information About Multihop BFD, page 29-2
• How to Configure Multihop BFD, page 29-2
• Configuration Examples for Multihop BFD, page 29-4
• Where to Go Next
• Additional References, page 29-6
• Feature Information for Multihop BFD, page 29-7