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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R012C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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Configuring MSTP

Configuring MSTP

Context

MSTP based on the basic STP/RSTP function divides a switching network into multiple regions, each of which has multiple spanning trees that are independent of each other. MSTP isolates different VLANs' traffic, and load-balances VLAN traffic. MSTP is configured on switches to trim a ring network to a loop-free network. Devices start spanning tree calculation after the working mode is set and MSTP is enabled. To intervene in the spanning tree calculation, use any of the following methods:

  • Manually configure the root bridge and secondary root bridge.

  • Set a priority for a switch in an MSTI. The lower the numerical value, the higher the priority of the switch and the more likely the switch becomes a root bridge.

  • Set a path cost for a port in an MSTI. The lower the numerical value, the smaller the cost of the path from the port to the root bridge and the more likely the port becomes a root port (assuming the same calculation method is used).

  • Set a priority for a port in an MSTI. The lower the numerical value, the more likely the port becomes a designated port.

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Updated: 2019-01-18

Document ID: EDOC1100038843

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