and S4820T.
9.0.0.0Introduced BFD for BGP on the Z9000.
8.3.19.0Introduced on the S4820T.
8.3.8.0Introduced BFD for BGP on the S4810.
8.4.1.3Introduced BFD for BGP on the E-Series ExaScale.
8.2.1.0Introduced BFD for OSPF and ISIS on the E-Series ExaScale.
7.6.1.0Introduced BFD for OSPF on the C-Series.
7.5.1.0Introduced BFD for ISIS on the E-Series.
7.4.1.0Introduced BFD for OSPF on the E-Series.
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-neighborsor ip ospf bfd all-neighborscommands 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-neighborscommand.
• 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).
Bidirectional Forwarding Detection (BFD)
Introduced BFD for VRRP and OSPFv3 on Z9000, S4810,

Defaults

Command Modes

Command History

Usage Information

Refer to Parameters.

ROUTER OSPF

ROUTER OSPFv3

ROUTER BGP

ROUTER ISIS

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.

9.0.2.0Introduced on the S6000.

9.2.(0.0)

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