Administrator 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.
Topics:
• bfd all-neighbors
• bfd disable
• bfd enable (Configuration)
• bfd enable (Interface)
• bfd interval
• bfd protocol-liveness
• ip route bfd
• ipv6 route bfd
• ip ospf bfd all-neighbors
• ipv6 ospf bfd all-neighbors
• neighbor bfd
• neighbor bfd disable
• show bfd neighbors
• vrrp bfd
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.
C9000 Series
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 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.
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