Users Guide

Bidirectional Forwarding Detection (BFD)
Bidirectional forwarding detection (BFD) is a detection protocol that provides fast forwarding path failure detection.
The Dell Networking 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 VLAN interfaces and port-channels
Topics:
• bfd all-neighbors
• ip route bfd
• neighbor bfd
• neighbor bfd disable
bfd all-neighbors
Enable BFD sessions with all neighbors discovered by Layer 3 protocols virtual router redundancy protocol (VRRP), 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
bfd all-neighbors [interval interval min_rx min_rx multiplier value role
{active | passive}]
Parameters
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 200.
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 1000. The default is 200.
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.
Defaults See Parameters.
Command Modes
ROUTER OSPF
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
9.10(0.0) Introduced on the S6100-ON.
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Bidirectional Forwarding Detection (BFD) 275