Reference Guide

Bidirectional Forwarding Detection (BFD) | 157
Changing physical port session parameters
BFD sessions are configured with default intervals and a default role (active). The parameters that can be
configured are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role.
These parameters are configured per interface; if you change a parameter, the change affects all physical
port sessions on that interface. Dell Networking recommends maintaining the default values.
To change session parameters on an interface:
View session parameters using the
show bfd neighbors detail command.
Figure 8-8. Changing Session Parameters for Physical Ports
Disabling and re-enabling BFD
BFD is enabled on all interfaces by default, though sessions are not created unless explicitly configured. If
BFD is disabled, all of the sessions on that interface are placed in an Administratively Down state
(Message 2), and the remote systems are notified of the session state change (Message 3).
Step Task Command Syntax Command Mode
1 Change session parameters for all
sessions on an interface.
bfd interval milliseconds min_rx milliseconds
multiplier value role [active | passive]
INTERFACE
FTOS(conf-if-te-4/24)#bfd interval 100 min_rx 100 multiplier 4 role passive
FTOS(conf-if-te-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: TenGigabitEthernet 4/24
State: Up
Configured parameters:
TX: 100ms, RX: 100ms, Multiplier: 4
Neighbor parameters:
TX: 100ms, RX: 100ms, Multiplier: 3
Actual parameters:
TX: 100ms, RX: 100ms, 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
Parameter Changes