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CLI-based Configuration Guide - Ethernet Switching

AR650, AR1600, and AR6100 V300R003

This document describes how to configure the components for LAN services, including link aggregation groups, VLANs, voice VLANs, MAC address tables, transparent bridging, as well as GVRP, STP/RSTP, and MSTP protocols.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
(Optional) Configuring a Path Cost of a Port in an MSTI

(Optional) Configuring a Path Cost of a Port in an MSTI

Context

A path cost is port-specific and is used by MSTP to select a link.

Path costs of ports are an important basis for calculating spanning trees. If you set different path costs for a port in different MSTIs, VLAN traffic can be transmitted along different physical links for load balancing.

The MSTP path cost determines root port selection in an MSTI. The port with the lowest path cost to the root bridge is selected as the root port.

In the Huawei calculation method for example, the link rate determines the recommended value for the path cost. The following table lists the recommended path costs for ports with different link rates.
Table 11-9  Mappings between link rates and path cost values

Link Rate

Recommended Path Cost

Recommended Path Cost Range

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

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.

Procedure

  1. Run system-view

    The system view is displayed.

  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 path cost.

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

  3. Run interface interface-type interface-number

    The Ethernet interface view is displayed.

  4. Run stp instance instance-id cost cost

    A path cost is set for the port in the current MSTI.

    • 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: 2019-04-12

Document ID: EDOC1100041791

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