Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 170
Disabling BFD for BGP, Use BFD in a BGP Peer Group, ROUTER BGP mode
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neighbor {ip-address | peer-group-name} bfd NOTES: • When you establish a BFD session with a specified BGP neighbor or peer group using the neighbor bfd command, the default BFD session parameters are used (interval: 200 milliseconds, min_rx: 200 milliseconds, multiplier: 3 packets, and role: active). • When you explicitly enable or disable a BGP neighbor for a BFD session with the neighbor bfd or neighbor bfd disable commands, the neighbor does not inherit the BFD enable/disable values configured with the bfd all-neighbors command or configured for the peer group to which the neighbor belongs. Also, the neighbor only inherits the global timer values configured with the bfd all-neighbors command (interval, min_rx, and multiplier). 6. Repeat Steps 1 to 5 on each BGP peer participating in a BFD session. Disabling BFD for BGP You can disable BFD for BGP. To disable a BFD for BGP session with a specified neighbor, use the first command. To remove the disabled state of a BFD for BGP session with a specified neighbor, use the second command. The BGP link with the neighbor returns to normal operation and uses the BFD session parameters globally configured with the bfd all-neighbors command or configured for the peer group to which the neighbor belongs. • Disable a BFD for BGP session with a specified neighbor. ROUTER BGP mode neighbor {ip-address | peer-group-name} bfd disable • Remove the disabled state of a BFD for BGP session with a specified neighbor. ROUTER BGP mode no neighbor {ip-address | peer-group-name} bfd disable Use BFD in a BGP Peer Group You can establish a BFD session for the members of a peer group (the neighbor peer-group-name bfd command in ROUTER BGP configuration mode). Members of the peer group may have BFD: • Explicitly enabled (the neighbor ip-address bfd command) • Explicitly disabled (the neighbor ip-address bfd disable command) • Inherited (neither explicitly enabled or disabled) according to the current BFD configuration of the peer group. For information about BGP peer groups, refer to Configure Peer Groups. If you explicitly enable (or disable) a BGP neighbor for BFD that belongs to a peer group: • The neighbor does not inherit the BFD enable/disable values configured with the bfd allneighbors command or configured for the peer group to which the neighbor belongs. • The neighbor inherits only the global timer values that are configured with the bfd all-neighbors command (interval, min_rx, and multiplier). If you explicitly enable (or disable) a peer group for BFD that has no BFD parameters configured (for example, advertisement interval) using the neighbor peer-group-name bfd command, the peer group inherits any BFD settings configured with the bfd all-neighbors command. 170 Bidirectional Forwarding Detection (BFD)
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