Defaults Refer to Parameters.
Command
Modes ROUTER OSPF
ROUTER OSPFv3
ROUTER BGP
ROUTER ISIS
Command
History This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.7(0.0) Introduced on the S6000–ON.
9.0.2.0 Introduced on the S6000.
9.2.(0.0) Introduced BFD for VRRP and OSPFv3 on Z9000, S4810,
and S4820T.
9.0.0.0 Introduced BFD for BGP on the Z9000.
8.3.19.0 Introduced on the S4820T.
8.3.8.0 Introduced BFD for BGP on the S4810.
8.4.1.3 Introduced BFD for BGP on the E-Series ExaScale.
8.2.1.0 Introduced BFD for OSPF and ISIS on the E-Series ExaScale.
7.6.1.0 Introduced BFD for OSPF on the C-Series.
7.5.1.0 Introduced BFD for ISIS on the E-Series.
7.4.1.0 Introduced BFD for OSPF on the E-Series.
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 you explicitly
enable BFD using the isis bfd all-neighbors command.
• 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).
You can only enable BFD for VRRP in INTERFACE command mode (vrrp bfd
all-neighbors).
318 Bidirectional Forwarding Detection (BFD)