Users Guide

Version Description
9.8(1.0) Introduced on the Z9100–ON.
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 S6000–ON.
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.
ip route bfd
Enable BFD for all neighbors configured through static routes.
Syntax
ip route bfd [prefix-list prefix-list-name] [interval interval min_rx
min_rx multiplier value role {active | passive}]
To disable BFD for all neighbors configured through static routes, use the no ip route bfd
[prefix-list prefix-list-name] [interval interval min_rx min_rx multiplier
value role {active | passive}] command.
Parameters
prefix-list prefix-
list-name
(Optional) Enter the keyword prefix-list followed by the name of the prefix
list to enable or disable BFD on specific neighbors.
interval
milliseconds
(OPTIONAL) Enter the keywords interval to specify non-default BFD session
parameters beginning with the transmission interval. The range is from 50 to 1000.
The default is 200.
276 Bidirectional Forwarding Detection (BFD)