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Configuration Guide - Reliability

S7700 and S9700 V200R011C10

This document describes the configuration of BFD, DLDP, VRRP, SmartLink, CFM, EFM, Y.1731 and MAC swap loopback to ensure reliability on the device.
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Licensing Requirements and Limitations for BFD

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.

Version Requirements

Table 2-6  Products and versions supporting BFD
Product Product Model Version


S7703, S7706, and S7712

V100R003C01, V100R006C00, V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10


S9703, S9706, and S9712

V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C10

To know details about software mappings, see Hardware Query Tool.

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.

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. The configuration is supported in the following situations:
  • The MPU is equipped with the ES0D00FSUA00 subcard or the MPU is EH1D2SRUDC00 or EH1D2SRUDC01.
  • For the S7706 and S7712, you need to first run the assign system-resource-mode static command to configure the switch to statically allocate module resources.

BFD sessions cannot be bound to a QinQ sub-interface.

Updated: 2019-09-23

N. documento: EDOC1000178318


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