Users Guide

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 [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 [interval interval min_rx min_rx multiplier value role
{active | passive}] command.
Parameters
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.
min_rx
milliseconds
Enter the keywords min_rx to specify the minimum rate at
which the local system receives control packets from the
remote system. The range is from 50 to 1000. The default is
200.
multiplier value Enter the keywords multiplier to specify the number of
packets that must be missed in order to declare a session down.
The range is from 3 to 50. The default is 3.
role [active |
passive]
Enter the role that the local system assumes:
Bidirectional Forwarding Detection (BFD) 355