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

RSTP Interface Settings

Cisco Small Business SF200E Series Advanced Smart Switch

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Designated Bridge ID—Bridge identifier of the bridge that offers the 
lowest root path cost to a LAN. The ID is a concatenation of the bridge 
priority and the base MAC address of the bridge.

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Designated Port ID—Port identifier on the Designated Bridge that offers 
the lowest root path cost to the LAN. The ID is a concatenation of the port 
priority and the interface number of the port.

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Designated Cost—The root path cost from the designated bridge to the 
root bridge. Ports with lower designated cost are less likely to be blocked 
when STP detects loops.

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Speed—Port speed.

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LAG—LAG that the port is a member of, if any.

Rapid Spanning Tree Protocol (RSTP) ensures a faster convergence of a loop-free 
spanning tree for any bridged LAN. To display the RSTP Interface Settings page, 
click Spanning Tree > RSTP Interface Settings in the navigation window.

A rapid spanning tree topology is formed automatically when RSTP is selected as 
the spanning tree mode. Use the STP Status & Global Settings page to enable 
RSTP mode.

By default, the RSTP Interface Settings Table displays information for each port. 
Use the Interface Type list to display ports or LAGs in the table. The RSTP 
Interface Table displays the following information for each port:

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Point to Point Operational Status—A physical port has a point-to-point 
connection to a LAN if it operates in full duplex. 

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Port Role—Port role assigned by the STP algorithm to provide to STP paths. 
The possible field values are:

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Root—Provides the lowest root path cost to the root bridge among all 
the ports in the switch.

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Designated—Provides the lowest root path cost to the root bridge from 
a LAN. The switch is the designated bridge in the LAN.

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Alternate—Provides an alternate path to the root bridge from the root 
interface.