Cisco Cisco SG200-26P 26-port Gigabit PoE Smart Switch メンテナンスマニュアル

MSTP Instance Settings

Cisco Small Business SF200E Series Advanced Smart Switch

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Backup—Provides a backup path to the designated port path toward 
the Spanning Tree leaves. Backup ports occur only when two ports are 
connected in a loop by a point-to-point link, or when a LAN has two or 
more connections connected to a shared segment.

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Disabled—The port is not participating in the Spanning Tree.

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Mode—Indicates whether the RSTP administrative mode is enabled or 
disabled for the port.

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Edge Port Operational Status—If enabled for the port or LAG, the port is 
automatically placed in the forwarding state. See 

 for instructions on modifying this setting.

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Port Status—The operational state of the port.

You can select a port and click Activate Protocol Migration to have the switch 
send RSTP BPDUs to the port. This can be used to test whether all legacy bridges 
on the LAN have been removed.

The Multiple Spanning Tree Protocol (MSTP) supports two instances of Spanning 
Tree. These instances include the common and internal spanning tree (CST) 
instance and user-defined instance that can be associated with one or more 
VLANs. Any VLANs associated with the user-defined instance are no longer 
associated with the CST. Each instance creates a separate spanning tree topology 
for the associated VLANs, enabling efficient channeling of VLAN traffic over 
network interfaces.

MSTP is compatible with both RSTP and STP; an MSTP bridge can be configured 
to behave entirely as a RSTP bridge or an STP bridge.