Huawei AR3200 Series - Page 263

Context
The rapid transition mechanism is also called the Proposal/Agreement mechanism. All switching
devices support the following modes:
l Enhanced mode: The current interface counts the root port calculation when it computes
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 as 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 to 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, and the designated port transitions to the
Forwarding state.
l Common mode: The current interface ignores the root port when it computes 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 as a root port and blocks all non-edge ports. The root
port then transitions to the Forwarding state.
– The downstream device responds to 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 devices are connected to non-Huawei devices, select the same mode as that used
on non-Huawei devices.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface interface-type interface-number
The view of the Ethernet interface participating in STP calculation is displayed.
Step 3 Run:
stp no-agreement-check
The common rapid transition mechanism is configured.
By default, the interface uses the enhanced rapid transition mechanism.
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Huawei AR3200 Series Enterprise Routers
Configuration Guide - LAN 8 MSTP Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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