Reference Guide

302 | Bidirectional Forwarding Detection (BFD)
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bfd all-neighbors
c e
Enable BFD sessions with all neighbors discovered by Layer 3 protocols IS-IS, OSPF, or BGP on
router interfaces, and (optionally) reconfigure the default timer values.
Syntax
bfd all-neighbors [interval interval min_rx min_rx multiplier value role {active | passive}]
Parameters
Defaults
See Parameters
Command Modes
ROUTER OSPF
ROUTER BGP
ROUTER ISIS (Not available on C-Series)
Command
History
Usage
Information
All neighbors inherit the timer values configured with the bfd all-neighbors command except in the
following cases:
• Timer values configured with the isis bfd all-neighbors command in INTERFACE mode override
timer values configured with the bfd all-neighbors command. Likewise, using the no bfd
all-neighbors command does not disable BFD on an interface if BFD is explicitly enabled using
the command isis bfd all-neighbors.
interval milliseconds
(OPTIONAL) Enter this keyword to specify non-default BFD session
parameters beginning with the transmission interval.
Range:50-1000
Default:100
min_rx milliseconds
Enter this keyword to specify the minimum rate at which the local system
would like to receive control packets from the remote system.
Range:50-100
Default:100
multiplier value
Enter this keyword to specify the number of packets that must be missed in
order to declare a session down.
Range:3-50
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 8.4.2.5 BFD for BGP was introduced on the C-Series and E-Series TeraScale.
Version 8.3.8.0 BFD for BGP was introduced on the S4810.
Version 8.4.1.3 BFD for BGP was introduced on the E-Series ExaScale.
Version 8.2.1.0 BFD for OSPF and ISIS introduced on the E-Series ExaScale.
Version 7.6.1.0 BFD for OSPF introduced on the C-Series.
Version 7.5.1.0 BFD for ISIS introduced on the E-Series.
Version 7.4.1.0 BFD for OSPF introduced on the E-Series.