Optional) Configuring Port Priorities - Huawei Quidway S7700 Configuration Manual - Ethernet

Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet
On a network where loops occur, you are recommended to set a relatively large path cost for the
port at a low link rate. STP/RSTP puts the port with the large path cost in the Blocking state and
blocks the link where this port resides.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
stp pathcost-standard { dot1d-1998 | dot1t | legacy }
A path cost calculation method is configured.
By default, the IEEE 802.1t standard method is used to calculate the default path cost.
All switching devices on a network must use the same calculation method for path costs.
Step 3 Run:
interface interface-type interface-number
The Ethernet interface view is displayed.
Step 4 Run:
stp cost cost
A path cost is set for the port.
l When the Huawei proprietory calculation method is used, cost ranges from 1 to 200000.
l When the IEEE 802.1d standard method is used, cost ranges from 1 to 65535.
l When the IEEE 802.1t standard method is used, cost ranges from 1 to 200000000.
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8.2.5 (Optional) Configuring Port Priorities

The lower the numerical value, the more likely the port on a switching device becomes a
designated port; the higher the numerical value, the more likely the port is to be blocked.
Context
Whether a port on a switching device will be selected as a designated port is determined by its
priority. For details, see
If you expect to block a port on a switching device to eliminate loops, set the port priority value
to be larger than the default value when the devices have the same bridge ID and the cost of
path. This port will be blocked in designated port selection.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Issue 01 (2011-07-15)
8.1.1 STP/RSTP
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Overview.
8 STP/RSTP Configuration
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