bfd (CUSP-forwarder view)
Function
The bfd command configures BFD for CUSP.
The undo bfd command disables BFD for CUSP.
By default, BFD for CUSP is not enabled.
This command is supported only on the NetEngine 8000 F1A.
Parameters
| Parameter | Description | Value |
|---|---|---|
| min-tx-interval tx-interval |
Specifies the minimum interval for sending BFD messages to the peer. |
The value is an integer that ranges from 50 to 1000, in milliseconds. |
| min-rx-interval rx-interval |
Specifies the minimum interval for receiving BFD messages from the peer. |
The value is an integer that ranges from 50 to 1000, in milliseconds. |
| tos-exp tos-value |
Specifies the TOS or EXP field. |
The value is an integer that ranges from 0 to 7. |
| detect-multiplier multiplier |
Specifies the local detect multiplier. |
The value is an integer that ranges from 3 to 50. |
Usage Guidelines
Usage Scenario
BFD for CUSP associates BFD with CUSP to accelerate CUSP fault detection. CUSP fault detection takes a long time. The default detection interval is 30 seconds, and the minimum detection interval is 2 seconds. In addition, when a master/slave main control board switchover occurs, the CPU may be too busy to send CUSP probe packets in a timely manner. In the preceding situations, the peer device may detect that the CUSP status is down and trigger a vBRAS-UP switchover mistakenly. BFD for CUSP overcomes the drawbacks of the existing detection mechanisms and provides fast fault. The detection multiplier, packet sending interval, packet receiving interval, and other parameters (such as the source IP address, destination IP address, and VPN instance) are obtained from the CUSP session configuration. The detection multiplier, packet sending interval, packet receiving interval, and other parameters (such as the source IP address, destination IP address, and VPN instance) are obtained from the CUSP session configuration.
Precautions
This command applies only to the CU separation scenario and can be run only on the vBRAS-CP. The command configuration is then delivered to the vBRAS-UP.
BFD for CUSP can take effect only after BFD is enabled in the system view of the corresponding vBRAS-UP.Example
<HUAWEI> system-view [~HUAWEI] cu-controller [*HUAWEI-cu-controller] up 1024 [*HUAWEI-cu-controller-up1024] config [*HUAWEI-cu-controller-up1024-config] cusp agent abc [*HUAWEI-cu-controller-up1024-config-cusp-agent-abc] bfd detect-multiplier 30 min-tx-interval 1000 min-rx-interval 1000 tos-exp 7