Spanning Tree Protocol
Configuring RSTP Interface Settings
Cisco 220 Series Smart Switches Administration Guide Release 1.1.0.x 151
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• Priority—Select the priority value of the interface. The priority value
influences the interface choice when a bridge has two ports connected in a
loop. The priority is a value from 0 to 240, set in increments of 16.
• Port State—Displays the current STP state of the interface.
- Disabled—STP is currently disabled on the interface. The interface
forwards traffic while learning MAC addresses.
- Blocking—The interface is currently blocked, and cannot forward traffic
(with the exception of BPDU data) or learn MAC addresses.
- Learning—The interface is in Learning mode, and cannot forward traffic,
but it can learn new MAC addresses.
- Forwarding—The interface is in Forwarding mode, and can forward
traffic and learn new MAC addresses.
• Designated Bridge ID—Displays the bridge priority and the MAC address
of the designated bridge.
• Designated Port ID—Displays the priority and interface ID of the selected
interface.
• Designated Cost—Displays the cost of the interface participating in the
STP topology. Interfaces with a lower cost are less likely to be blocked if
STP detects loops.
STEP 5 Click Apply. The STP interface settings are modified, and the Running
Configuration is updated.
Configuring RSTP Interface Settings
Rapid Spanning Tree Protocol (RSTP) enables a faster STP convergence without
creating forwarding loops.
Use the RSTP Interface Settings page to configure RSTP per port. Any
configuration that is done on this page is active when the global STP mode is set
to RSTP or MSTP.
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