Command Line Reference Guide

8
Bidirectional Forwarding Detection (BFD)
Bidirectional forwarding detection (BFD) is a detection protocol that provides fast forwarding path failure
detection.
The Dell Networking Operating System (OS) implementation is based on the standards specified in the
IETF Draft draft-ietf-bfd-base-03 and supports BFD on all Layer 3 physical interfaces including virtual
local area network (VLAN) interfaces and port-channels.
bfd all-neighbors
Enable BFD sessions with all neighbors discovered by Layer 3 protocols intermediate system to
intermediate system (IS-IS), open shortest path first (OSPF), OSPFv3, or border gateway protocol (BGP) on
router interfaces, and (optionally) reconfigure the default timer values.
Syntax
[vrrp] bfd all-neighbors [interval interval min_rx min_rx
multiplier value role {active | passive}]
Parameters
vrrp Enter the keyword vrrp in INTERFACE mode to enable BFD
for VRRP.
interval
milliseconds
(OPTIONAL) Enter the keyword interval to specify non-
default BFD session parameters beginning with the
transmission interval. The range is from 50 to 1000. The
default is 100.
min_rx
milliseconds
Enter the keyword min_rx to specify the minimum rate at
which the local system would like to receive control packets
from the remote system. The range is from 50 to 100. The
default is
100.
multiplier value Enter the keyword 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:
• Active — The active system initiates the BFD session.
Both systems can be active for the same session.
• Passive — The passive system does not initiate a
session. It only responds to a request for session
initialization from the active system.
The default is active.
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Bidirectional Forwarding Detection (BFD)