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Spanning Tree
RSTP Interface Settings
RSTP Interface Settings
Cisco Small Business SG200 Series 8-port Smart Switches Administration Guide
•
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.
•
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.
•
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.
•
Speed—Port speed.
•
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 Settings Table displays the following information for each port:
•
Point to Point Operational Status—A physical port has a point-to-point
connection to a LAN if it operates in full duplex.
•
Port Role—Port role assigned by the STP algorithm to provide to STP paths.
The possible field values are:
-
Root—Provides the lowest root path cost to the root bridge among all
the ports in the switch.
-
Designated—Provides the lowest root path cost to the root bridge from
a LAN. The switch is the designated bridge in the LAN.
-
Alternate—Provides an alternate path to the root bridge from the root
interface.
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