Users Guide

Changing Physical Port Session Parameters
Congure BFD sessions with default intervals and a default role (active).
The parameters that you can congure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role. Congure
these parameters per interface; if you change a parameter, the change aects 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]
Changing Session Parameters for Physical Ports
View session parameters using the show bfd neighbors detail command.
The bold line shows the parameter changes.
R1(conf-if-gi-4/24)#bfd interval 200 min_rx 200 multiplier 4 role passive
R1(conf-if-gi-4/24)#do show bfd neighbors detail
Session Discriminator: 1
Neighbor Discriminator: 1
Local Addr: 2.2.2.1
Local MAC Addr: 00:01:e8:09:c3:e5
Remote Addr: 2.2.2.2
Remote MAC Addr: 00:01:e8:06:95:a2
Int: GigabitEthernet 4/24
State: Up
Configured parameters:
TX: 200ms, RX: 200ms, Multiplier: 4
Neighbor parameters:
TX: 200ms, RX: 200ms, Multiplier: 3
Actual parameters:
TX: 200ms, RX: 200ms, Multiplier: 4
Role: Passive
Delete session on Down: False
Client Registered: CLI
Uptime: 00:09:06
Statistics:
Number of packets received from neighbor: 4092
Number of packets sent to neighbor: 4093
Number of state changes: 1
Number of messages from IFA about port state change: 0
Number of messages communicated b/w Manager and Agent:
7
Disabling and Re-Enabling BFD
BFD is enabled on all interfaces by default, though sessions are not created unless explicitly congured.
If you disable BFD, all of the sessions on that interface are placed in an Administratively Down state ( the rst message example), and the
remote systems are notied of the session state change (the second message example).
To disable and re-enable BFD on an interface, use the following commands.
• Disable BFD on an interface.
INTERFACE mode
no bfd enable
• Enable BFD on an interface.
148
Bidirectional Forwarding Detection (BFD)