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Table Of Contents
Configure BFD for VRRP
Configure BFD for VLANs
Configuring Protocol Liveness
Configure BFD for Physical Ports
BFD on physical ports is useful when you do not enable the routing protocol.
Without BFD, if the remote system fails, the local system does not remove the connected route until the first failed attempt to
send a packet. When you enable BFD, the local system removes the route as soon as it stops receiving periodic control packets
from the remote system.
Configuring BFD for a physical port is a two-step process:
1. Enable BFD globally. Refer to Enabling BFD Globally.
2. Establish a session with a next-hop neighbor.
Related Configuration Tasks
Changing Physical Port Session Parameters.
Disabling and Re-Enabling BFD.
Enabling BFD Globally
You must enable BFD globally on both routers.
To enable the BFD globally, use the following command.
Enable BFD globally.
CONFIGURATION mode
bfd enable
To verify that BFD is enabled globally, use the show running bfd command.
The bold line shows that BFD is enabled.
R1(conf)#bfd ?
enable Enable BFD protocol
protocol-liveness Enable BFD protocol-liveness
R1(conf)#bfd enable
R1(conf)#do show running-config bfd
!
bfd enable
R1(conf)#
Changing Physical Port Session Parameters
Configure BFD sessions with default intervals and a default role (active).
The parameters that you can configure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system
role. Configure these parameters per interface; if you change a parameter, the change affects all physical port sessions on that
interface.
NOTE: Dell Networking recommends maintaining the default values.
Change session parameters for all sessions on an interface.
INTERFACE mode
bfd interval milliseconds min_rx milliseconds multiplier value role [active | passive]
View session parameters using the show bfd neighbors detail command.
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Bidirectional Forwarding Detection (BFD)