Configuring Interoperability Between Huawei and Non-Huawei Devices

To implement interoperability between Huawei and non-Huawei devices, select the fast transition mode based on the Proposal/Agreement mechanism of the non-Huawei device. A device supports the following fast transition modes:

• Enhanced mode: The device determines the root port when it calculates the synchronization flag bit. The following describes the process:

  1. An upstream device sends a Proposal message to a downstream device to request fast state transition. After receiving the message, the downstream device sets the port connected to the upstream device as the root port and blocks all non-edge ports.

  2. The upstream device sends an Agreement message to the downstream device. After the downstream device receives the message, the root port transitions to the Forwarding state.

  3. The downstream device responds with an Agreement message. After receiving the message, the upstream device sets the port connected to the downstream device as the designated port, and then the designated port transitions to the Forwarding state.

• Common mode: The device ignores the root port when it calculates the synchronization flag bit. The following describes the process:

  1. An upstream device sends a Proposal message to a downstream device to request fast state transition. After receiving the message, the downstream device sets the port connected to the upstream device as the root port and blocks all non-edge ports. Then, the root port transitions to the Forwarding state.

  2. The downstream device responds with an Agreement message. After receiving the message, the upstream device sets the port connected to the downstream device as the designated port, and then the designated port transitions to the Forwarding state.

On an STP network, if a Huawei device is connected to a non-Huawei device that uses a different Proposal/Agreement mechanism, the two devices may fail to interoperate with each other. Select the enhanced mode or common mode based on the Proposal/Agreement mechanism of the non-Huawei device.

Pre-configuration Tasks

Before setting parameters for interoperation between Huawei and non-Huawei devices, configure basic STP/RSTP functions.