Service Manual
ROUTER ISIS
Command History
This guide is platform-specic. 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
9.8(0.0) Introduced on the S3048-ON and S4048-ON.
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 congured with the bfd neighbor command except in the following
cases:
• Timer values congured with the isis bfd all-neighbors or ip ospf bfd all-neighbors
commands in INTERFACE mode override timer values congured 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 congured with the bfd neighbor command or congured for the peer group to which
a neighbor belongs. The neighbors inherit only the global timer values (congured with the bfd
neighbor command).
You can only enable BFD for VRRP in INTERFACE command mode (vrrp bfd all-neighbors).
Related Commands
neighbor bfd disable — Explicitly disables a BFD session with a BGP neighbor or a BGP peer group.
bfd disable
Disable BFD on an interface.
Syntax
bfd disable
322
Bidirectional Forwarding Detection (BFD)