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S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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(Optional) Setting a Path Cost for a Port

(Optional) Setting a Path Cost for a Port

Context

Path cost is the reference value used for link selection on an STP/RSTP network.

The path cost value range is determined by the calculation method. After the calculation method is determined, it is recommended that you set smaller path cost values for the ports with higher link rates.

In the Huawei calculation method, the link rate determines the recommended value for the path cost. Table 14-14 lists the recommended path costs for ports with different link rates.
Table 14-14  Mappings between link rates and path cost values

Link Rate

Recommended Path Cost

Recommended Path Cost Range

Allowable Path Cost Range

10 Mbit/s

2000

200 to 20000

1 to 200000

100 Mbit/s

200

20 to 2000

1 to 200000

1 Gbit/s

20

2 to 200

1 to 200000

10 Gbit/s

2

2 to 20

1 to 200000

Over 10 Gbit/s

1

1 to 2

1 to 200000

If a network has loops, it is recommended that you set a large path cost for ports with low link rates so that STP/RSTP blocks these ports.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. (Optional) Run:

    stp pathcost-standard { dot1d-1998 | dot1t | legacy }

    A path cost calculation method is specified.

    By default, the IEEE 802.1t standard (dot1t) is used to calculate the path costs.

    All switching devices on a network must use the same path cost calculation method.

  3. Run:

    interface interface-type interface-number

    The view of an interface participating in STP calculation is displayed.

  4. Run:

    stp cost cost

    A path cost is set for the interface.

    • When the Huawei calculation method is used, cost ranges from 1 to 200000.
    • When the IEEE 802.1d standard method is used, cost ranges from 1 to 65535.
    • When the IEEE 802.1t standard method is used, cost ranges from 1 to 200000000.

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Updated: 2019-08-21

Document ID: EDOC1000142081

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