Reference Guide

206 | Bidirectional Forwarding Detection (BFD)
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Defaults
Parameters
Command Modes
ROUTER OSPF
ROUTER BGP
ROUTER ISIS
Command
History
Usage
Information
All neighbors inherit the timer values configured with the bfd neighbor command except in
the following cases:
• Timer values configured with the isis bfd all-neighbors or ip ospf bfd all-neighbors
commands in INTERFACE mode override timer values configured with the bfd neighbor
command. Likewise, using the no bfd neighbor command does not disable BFD on an
interface if BFD is explicitly enabled using the command isis bfd all-neighbors.
• Neighbors that have been explicitly enabled or disabled for a BFD session with the bfd
neighbor or neighbor bfd disable commands in ROUTER BGP mode do not inherit the
global BFD enable/disable values configured with the bfd neighbor command or
configured for the peer group to which a neighbor belongs. The neighbors inherit only the
global timer values (configured with the bfd neighbor command).
Related
Commands
neighbor bfd
z
Explicitly enable a BFD session with a BGP neighbor or a BGP peer group.
multiplier value
Enter this keyword to specify the number of packets that must be
missed in order to declare a session down.
Range: 3 to 50
Default: 3
role [active | passive] Enter the role that the local system assumes:
• Active—The active system initiates the BFD session. Both
systems can be active for the same session.
• Passive—The passive system does not initiate a session. It only
responds to a request for session initialization from the active
system.
Default: Active
Version 9.0.2.0 Introduced on the S6000
Version 9.0.0.0 BFD for BGP was introduced on the Z9000.
Version 8.3.8.0 BFD for BGP was introduced on the S4810.
neighbor bfd Explicitly enable a BFD session with a BGP neighbor or a BGP peer
group.
neighbor bfd disable Explicitly disable a BFD session with a BGP neighbor or a BGP peer
group.
S6000