Configuring The Proposal/Agreement Mechanism - Huawei Quidway S7700 Configuration Manual - Ethernet

Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet
tasks, and obtain the required data. This will help you complete the configuration task quickly
and accurately.
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:
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Data Preparation
To configure STP/RSTP interoperability between Huawei devices and non-Huawei devices, you
need the following data.
No.
1

8.5.2 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. Switching
devices currently support the following modes:
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Issue 01 (2011-07-15)
Configuring basic STP/RSTP functions
Data
BPDU format
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.
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