Service Manual

Table Of Contents
ROUTER OSPFv3
ROUTER BGP
ROUTER ISIS
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
Networking OS Command Line Reference Guide.
Version Description
9.8(1.0) Introduced on the Z9100ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000ON.
9.0.2.0 Introduced on the S6000.
9.2(1.0) Introduced on the Z9500.
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.
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 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).
Related
Commands
neighbor bfd disable disable a BFD session explicitly with a BGP neighbor or a BGP peer group.
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
294 Bidirectional Forwarding Detection (BFD)