Licensing Requirements and Limitations for BFD

Involved Network Elements

Other network elements are required to support BFD functions.

Licensing Requirements

BFD is a basic feature of a switch and is not under license control.

Feature Support in V200R019C10

Only the following switch models support BFD:

S5720-EI, S5720-HI, S5720I-SI, S5720S-SI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5730-HI, S5730S-EI, S5730-SI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6720S-SI, S6720-SI, S6730-H, S6730S-H, S6730-S, and S6730S-S.

For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Feature Limitations

If a loop occurs on the path detected by BFD, the change of the network topology where the loop exists may cause the BFD session to flap at one time.

In V200R013 and earlier versions, when BFD is bound to a sub-interface, only dot1q terminal sub-interface supports BFD function.

When the BFD session is bound to the Eth-Trunk and the detection time is less than 300 ms, you are not advised to add or delete Eth-Trunk member interfaces. Otherwise, the BFD session may flap.

To implement 50-ms switching, the device must support the 3.3-ms interval for sending and receiving BFD packets. Only the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this function, and you need to run the set service-mode command in the system view to configure the switch to work in enhanced mode.