Administrator Guide

Version Description
8.2.1.0 Introduced BFD for OSPF and ISIS on the E-Series.
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 congured with the bfd neighbor command except in the following cases:
• Timer values congured with the isis bfd all-neighbors or ip ospf bfd all-neighbors
commands in INTERFACE mode override timer values congured 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 congured with the bfd neighbor command or congured for the peer group to which a neighbor
belongs. The neighbors inherit only the global timer values (congured with the bfd neighbor command).
You can only enable BFD for VRRP in INTERFACE command mode (vrrp bfd all-neighbors).
You can enable BFD on a nondefault VRF for OSPFv2.
bfd disable
Disable BFD on an interface.
Syntax
bfd disable
Re-enable BFD using the no bfd disable command.
Defaults BFD is disabled by default.
Command Modes VRRP
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.2(1.0) Introduced on the Z9500.
9.2(0.2) Introduced on S4810.
9.0.0.0 Introduced on the Z9000.
8.3.19.0 Introduced on the S4820T.
8.2.1.0 Introduced on the E-Series.
7.6.1.0 Introduced on the C-Series.
7.5.1.0 Introduced on the E-Series.
328 Bidirectional Forwarding Detection (BFD)