Configuring the Proposal/Agreement Mechanism

To enable Huawei Datacom devices to communicate with non-Huawei devices, a proper rapid transition mechanism needs to be configured on Huawei devices based on the Proposal/Agreement mechanism on non-Huawei devices.

Context

The rapid transition mechanism is also called the Proposal/Agreement mechanism. Devices currently support the following modes:

Enhanced mode: The current interface counts a root port when it counts the synchronization flag bit.
- An upstream device sends a Proposal message to a downstream device, requesting rapid status transition. After receiving the message, the downstream device sets the port connected to the upstream device to a root port and blocks all non-edge ports.
- The upstream device then sends an Agreement message to the downstream device. After the downstream device receives the message, the root port transitions to the Forwarding state.
- The downstream device responds the Proposal message with an Agreement message. After receiving the message, the upstream device sets the port connected to the downstream device as a designated port. The designated port then transitions to the Forwarding state.
Common mode: The current interface ignores the root port when it counts the synchronization flag bit.
- An upstream device sends a Proposal message to a downstream device, requesting rapid status transition. After receiving the message, the downstream device sets the port connected to the upstream device to a root port and blocks all non-edge ports. The root port then transitions to the Forwarding state.
- The downstream device responds the Proposal message with an Agreement message. After receiving the message, the upstream device sets the port connected to the downstream device as a designated port. The designated port then transitions to the Forwarding state.

When Huawei datacom devices are interworking with non-Huawei devices, select either mode depending on the Proposal/Agreement mechanisms on non-Huawei devices.

Applicable Environment

On a network running STP/RSTP, inconsistent protocol packet formats and BPDU keys may lead to a communication failure. Configuring proper STP/RSTP parameters on Huawei devices ensures interoperability between Huawei devices and non-Huawei devices.

Pre-configuration Tasks

Before configuring STP/RSTP interoperability between Huawei devices and non-Huawei devices, complete the following task:

Configuring basic STP/RSTP functions

Procedure

Run system-view
The system view is displayed.
Run interface interface-type interface-number
The view of the Ethernet interface participating in STP calculation is displayed.

The following configuration can be configured both on a Layer 2 interface and a Layer 3 interface.
Run stp no-agreement-check
The common rapid transition mechanism is configured.
Run commit
The configuration is committed.

Verifying the Proposal/Agreement Mechanism Configuration

Run the display this command in the view of the interface participating in STP calculation to view the fast transition mechanism configured on the interface.