Setting Parameters for Interoperation Between Huawei and Non-Huawei Devices

A switching device supports the following Proposal/Agreement modes:

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

  1. An upstream device sends a Proposal message to a downstream device to request a 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.

  1. An upstream device sends a Proposal message to a downstream device to request a 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 switching device is connected to a non-Huawei device that uses a different Proposal/Agreement mechanism, the two devices may not be able to interoperate. Select the mode that matches 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.