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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 29 Configuring Multihop Bidirectional Forwarding Detection
Restrictions for Multihop BFD
Restrictions for Multihop BFD
The following are the restrictions for multihop BFD:
• BFD does not support echo mode. You can configure sessions for minimum timer interval.
• The minimum guaranteed timer depends on the topology, scale, number of hops, and control plane
processing. All the packets must reach the control plane since echo mode is not supported.
• Supports IPv4 deployments only.
• Authentication for multihop BFD is not enabled on Cisco ASR901 routers.
Information About Multihop BFD
• Overview of Multihop BFD, page 29-2
Overview of Multihop BFD
Cisco ASR 901 supports BFD on arbitrary paths, which can span multiple network hops. You must
configure the bfd-template and bfd map commands to create a multihop template and associate it with
one ore more maps of destinations and associated timers. You can enable authentication and configure a
key chain for multihop BFD sessions.
How to Configure Multihop BFD
This section contains the following procedures:
• Configuring Multihop BFD Template
• Configuring a Multihop BFD Map
Configuring Multihop BFD Template
Complete the following steps to create a multihop BFD template and configure BFD interval timers,
authentication, and key chain:
SUMMARY STEPS
1. enable
2. configure terminal
3. bfd-template multihop template-name
4. interval min-tx milliseconds min-rx milliseconds multiplier multiplier-value
5. authentication authentication-type keychain keychain-name
6. end