Link Rate Recommended
Path Cost
Recommended
Path Cost Range
Path Cost Range
10 Gbit/s 2 2 to 20 1 to 200000
Higher than 10 Gbit/
s
1 1 to 2 1 to 200000
If a network has loops, it is recommended that you set a relatively large path cost for ports with
low link rates. MSTP then blocks these ports.
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 (dot1t) is used to calculate the default path cost.
All switching devices on a network must use the same path cost calculation method.
Step 3 Run:
interface interface-type interface-number
The view of the Ethernet interface participating in STP calculation is displayed.
Step 4 Run:
stp instance instance-id cost cost
A path cost is set for the port in the current MSTI.
l When the Huawei proprietary 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.
----End
8.3.6 (Optional) Configuring a Port Priority in an MSTI
A port with a smaller priority value is more likely to be selected as a designated port, and a port
with a larger priority value is more likely to be blocked.
Context
During spanning tree calculation, port priorities in MSTIs determine which ports are selected as
designated ports.
To block a port in an MSTI to eliminate loops, set the port priority value to larger than the default
value. This port will be blocked during designated port selection.
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.
236
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