Describes ACL, port, and ICMPv6 considerations that affect BFD session establishment and operation for BGP environments.
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UMPP and LPTS ACLs apply only while a BFD session is being established and the remote discriminator is 0.
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After the session is established, BFD is offloaded to hardware, and control packets bypass UMPP ACL processing.
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Changes to UMPP ACLs after session establishment do not affect active BFD sessions.
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Use these UDP ports:
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3784for single-hop BFD -
4784for multihop BFD -
6784for IETF BFD over bundle
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For IPv6 control-plane reachability, permit ICMPv6 if the ACL contains an implicit deny rule.