Administrator Guide

interval
milliseconds
(OPTIONAL) Enter the keyword interval to specify non-default BFD session
parameters beginning with the transmission interval. The range is 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 50 to 1000. The
default is 200.
multiplier Enter the keyword 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 is Active.
Defaults See Parameters.
Command Modes INTERFACE
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.2.1.0 Introduced on the E-Series ExaScale.
7.6.1.0 Introduced on the C-Series.
7.5.1.0 Introduced on the E-Series.
Usage Information
When BFD is enabled with VRRP neighbors, the VRRP protocol registers with the BFD manager on the route
processor. BFD sessions are established with all neighboring interfaces participating in VRRP. If a neighboring
interface fails, the BFD agent on the line card notifies the BFD manager, which in turn notifies the VRRP protocol
that a link state change occurred.
312 Bidirectional Forwarding Detection (BFD)