Can S series switches support BFD


S series switches' (except S1700 switches) support for BFD is described as follows:
- S2700 series: not supported
- S3700 series: not supported by SI series, but supported by EI and HI series
- S5700 series: not supported by SI and LI series, but supported by EI and HI series
- S6700 series: supported
- S7700 series: supported
- S9700 series: supported
- S9300 series: supported
- S12700 series: supported

Other related questions:
Differences between dynamic BFD for IS-IS and static BFD for IS-IS on S series switches
The differences between dynamic BFD for IS-IS and static BFD for IS-IS are as follows: Dynamic BFD for IS-IS is triggered by upper-layer protocols. BFD sessions are dynamically established and link failures are detected based on BFD session status. Static BFD for IS-IS is manually configured to detect link failures.

For S series switches, whether the BFD echo function supports multi-hop BFD sessions
For S series switches (except S1700), BFD echo is applicable only to single-hop BFD sessions. Between two directly connected switches, one switch supports BFD, but the other does not support BFD and supports only forwarding at the network layer. To rapidly detect forwarding failures between the two switches, configure the BFD echo function on the BFD-supported device. The BFD-supported switch sends an Echo Request to the remote device, and the remote device sends the Echo Request back along the same path to detect the connectivity of the forwarding link.

Can BFD on S series switches interwork with non-Huawei devices
BFD supported by S series switches (except S1700 switches) complies with the standard protocol, so they can interwork with other BFD-supported devices. Note that you need to configure the same intervals for sending and receiving BFD packets on the local and peer devices.

How to configure the BFD echo function for S series switches
You can configure BFD echo on S series switches (except S1700 switches) to achieve rapid detection of link failures. The networking is shown as follows: SwitchA( Switch A and Switch B are directly connected through a link. SwitchA supports BFD, while SwitchB does not. Perform the following configuration: [SwitchA] bfd //Enable BFD. [SwitchA-bfd] quit [SwitchA] bfd atob bind peer-ip interface vlanif13 source-ip one-arm-echo //Create a BFD echo session. [SwitchA-bfd-session-atob] discriminator local 1 //Configure the BFD echo session identifier. [SwitchA-bfd-session-atob] commit

Precautions for the configuration of multicast BFD sessions on S series switches
For S series switches, the packets sent by multicast BFD are untagged. When a BFD interface receives a tagged BFD packet, the BFD module checks whether the VLAN ID of the BFD packet is the same as the default VLAN ID on the interface. If not, the BFD module discards the packet. To configure multicast BFD on an interface, run the port default vlan command to specify the default VLAN of the interface.

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