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AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009 CLI-based Configuration Guide - Ethernet Switching

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Configuring Basic MSTP Functions

Configuring Basic MSTP Functions

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.

Context

MSTP is commonly configured on switching devices 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. Use any of the following methods if you need to intervene in the spanning tree calculation:

  • Manually configure the root bridge and secondary root bridge.

  • Set a priority for a switching device in an MSTI: The lower the numerical value, the higher the priority of the switching device and the more likely the switching device becomes a root bridge; the higher the numerical value, the lower the priority of the switching device and the less likely that the switching device becomes a root bridge.

  • Set a path cost for a port in an MSTI: With the same calculation method, 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; the higher the numerical value, the larger the cost of the path from the port to the root bridge and the less likely that the port becomes a root port.

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

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Updated: 2019-05-17

Document ID: EDOC1000174108

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