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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

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) Configuring a Priority for a Switch in an MSTI

(Optional) Configuring a Priority for a Switch in an MSTI

Context

In an MSTI, there can be only one root bridge, which is the logical center of the MSTI. The root bridge should be a high-performance switch; however, the priority of such a device may not be the highest on the network. To ensure that such a device is selected as the root bridge, set a low priority for low-performance switches, and set a high priority for high-performance switches. A smaller priority value indicates a higher priority.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run stp process process-id

    The MSTP process view is displayed.

  3. Run stp [ instance instance-id ] priority priority

    A priority is set for the switch in an MSTI.

    The default priority value of the switch is 32768.

    If instance-id is not specified, a priority is set for the switch in MSTI 0.

    NOTE:
    • To configure a switch as the primary root bridge, run the stp [ instance instance-id ] root primary command directly. The priority value of this switch is 0.

    • To configure a switch as the secondary root bridge, run the stp [ instance instance-id ] root secondary command. The priority value of this switch is 4096.

      In an MSTI, a switch cannot act as the primary root bridge and secondary root bridge at the same time.

    • If the stp [ instance instance-id ] root primary or stp [ instance instance-id ] root secondary command has been executed to configure the device as the root bridge or secondary root bridge, to change the device priority, run the undo stp [ instance instance-id ] root command to disable the root bridge or secondary root bridge function and run the stp [ instance instance-id ] priority priority command to set a priority.

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Updated: 2019-10-18

Document ID: EDOC1000178310

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