Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.1P1 - Page 158
Disabling BFD for BGP, Use BFD in a BGP Peer Group, Displaying BFD for BGP Information
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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 allneighbors 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 all-neighbors 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 allneighbors command. Displaying BFD for BGP Information You can display related information for BFD for BGP. To display information about BFD for BGP sessions on a router, use the following commands and refer to the following examples. • Verify a BFD for BGP configuration. EXEC Privilege mode show running-config bgp • Verify that a BFD for BGP session has been successfully established with a BGP neighbor. A line-by-line listing of established BFD adjacencies is displayed. EXEC Privilege mode 158 Bidirectional Forwarding Detection (BFD)
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