Reference Guide

310 | Bidirectional Forwarding Detection (BFD)
www.dell.com | support.dell.com
Usage
Information
When you enable a BFD session with a specified BGP neighbor or peer group using the bfd neighbor
command, the default BFD session parameters are used (interval: 100 milliseconds, min_rx: 100
milliseconds, multiplier: 3 packets, and role: active) if no parameters have been specified with the bfd
all-neighbors
command.
When you explicitly enable a BGP neighbor for a BFD session with the bfd neighbor command:
• The neighbor does not inherit the global BFD enable values configured with the bfd all-neighbors
command or configured for the peer group to which the neighbor belongs.
• The neighbor only inherits the global timer values configured with the bfd all-neighbors command:
interval, min_rx, and multiplier.
Related
Commands
neighbor bfd disable
c e
Explicitly disable a BFD session with a BGP neighbor or a BGP peer group.
Syntax
neighbor {ip-address | peer-group-name} bfd disable
Parameters
Defaults
None
Command Modes
ROUTER BGP
Command
History
Usage
Information
When you explicitly disable a BGP neighbor for a BFD session with the neighbor bfd disable
command, the neighbor does not inherit the global BFD values configured with the bfd all-neighbors
command or configured for the peer group to which the neighbor belongs.
When you remove the disabled state of a BFD for BGP session with a specified neighbor by entering
the no neighbor bfd disable command, the BGP neighbor uses the BFD session parameters globally
configured with the bfd all-neighbors command or configured for the peer group to which the neighbor
belongs.
Related
Commands
bfd all-neighbors Enable BFD sessions with all neighbors discovered by Layer 3 protocols.
neighbor bfd disable Explicitly disable a BFD session with a BGP neighbor or a BGP peer group.
show bfd neighbors Display BFD neighbor information on all interfaces or a specified interface.
ip-address
Enter the IP address of the BGP neighbor that you want to explicitly disable for
BFD sessions in dotted decimal format (A.B.C.D).
peer-group-name
Enter the name of the peer group that you want to explicitly disable for BFD
sessions.
Version 8.4.2.5 Introduced on the C-Series and E-Series TeraScale.
Version 8.3.8.0 Introduced on the S4810.
Version 8.3.7.0 Introduced on the S4810.
Version 8.4.1.3 Introduced on the E-Series ExaScale.
bfd all-neighbors Enable BFD sessions with all neighbors discovered by Layer 3 protocols.
bfd neighbor Explicitly enable a BFD session with a BGP neighbor or a BGP peer group.
show bfd neighbors Display BFD neighbor information on all interfaces or a specified interface.