Reference Guide

128 | Bidirectional Forwarding Detection (BFD)
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Figure 7-7. Viewing Session Details
When both interfaces are configured for BFD, log messages are displayed indicating state changes, as
shown in Message 1.
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 Force10 recommends maintaining the default values.
To change session parameters on an interface:
View session parameters using the
show bfd neighbors detail command.
Message 1 BFD Session State Changes
R1(conf-if-gi-4/24)#00:36:01: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Down for
neighbor 2.2.2.2 on interface Gi 4/24 (diag: 0)
00:36:02: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Up for neighbor 2.2.2.2 on
interface Gi 4/24 (diag: 0)
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
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: 100ms, RX: 100ms, Multiplier: 3
Neighbor parameters:
TX: 100ms, RX: 100ms, Multiplier: 3
Actual parameters:
TX: 100ms, RX: 100ms, Multiplier: 3
Role: Active
Delete session on Down: False
Client Registered: CLI
Uptime: 00:03:57
Statistics:
Number of packets received from neighbor: 1775
Number of packets sent to neighbor: 1775
Number of state changes: 1
Number of messages from IFA about port state change: 0
Number of messages communicated b/w Manager and Agent: 4