Reference Guide

9
Bidirectional Forwarding Detection (BFD)
Bidirectional forwarding detection (BFD) is a detection protocol that provides fast forwarding path failure
detection.
Dell Networking OS 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 is supported on the S5000.
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), or border gateway protocol (BGP) on router
interfaces, and (optionally) reconfigure the default timer values.
S5000
Syntax
bfd all-neighbors [interval interval min_rx min_rx multiplier
value role {active | passive}]
Parameters
interval
milliseconds
(OPTIONAL) Enter the keywords interval to specify non-
default BFD session parameters beginning with the
transmission interval. The range is 50 to 1000. The default is
100.
min_rx
milliseconds
Enter the keywords 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 50 to 100. The default
is
100.
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 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 it active.
Bidirectional Forwarding Detection (BFD)
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