No. Data
4 Whether a port is enabled with rapid transition mechanism
5 Whether a port needs to transition to the RSTP mode
6 Maximum number of sent BPDUs
7 Whether a port needs to be configured as an edge port
8 Whether auto recovery needs to be configured for an edge port being shut down
9 Whether a port needs to clear statistics of the spanning tree
10 Whether an edge port needs to be configured as a BPDU filter
8.3.2 Setting System Parameters
STP/RSTP parameters that may affect network convergence include the network diameter, hello
time, and timeout period for waiting for BPDUs from the upstream (3 x hello time x time factor).
Therefore, STP/RSTP parameters need to be set properly to help implement rapid network
convergence.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
stp bridge-diameter diameter
The network diameter is configured.
By default, the network diameter is 7.
l RSTP uses a single spanning tree instance on the entire network, which cannot prevent the
performance from deteriorating when the network scale grows. Therefore, the network
diameter cannot be larger than 7.
l It is recommended that you run the stp bridge-diameter diameter command to set the
network diameter. Then, the switching device calculates the optimal Forward Delay period,
Hello time, and Max Age period based on the set network diameter.
Step 3 Run:
stp timer-factor factor
The timeout period for waiting for BPDUs from the upstream of a switching device is set.
By default, the timeout period of a switching device is 9 times as long as the Hello time.
Step 4 (Optional) To set the Forward Delay period, Hello time, and Max Age period, perform the
following operations:
l Run the stp timer forward-delay forward-delay command to set the Forward Delay period
for a switching device.
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 8 STP/RSTP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
397
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