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8-8
Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-29225-01
Chapter 8 Configuring Spanning Tree Protocol
Configuring STP Features
• Receives BPDUs
Forwarding State
An interface in the forwarding state forwards frames. The interface enters the forwarding state from the
learning state.
An interface in the forwarding state performs as follows:
• Receives and forwards frames received on the port
• Learns addresses
• Receives BPDUs
Disabled State
An interface in the disabled state does not participate in frame forwarding or in the spanning tree. An
interface in the disabled state is nonoperational.
A disabled interface performs as follows:
• Discards frames received on the port
• Does not learn addresses
• Does not receive BPDUs
Configuring STP Features
You complete three major steps to configure STP on the access point/bridge:
1. If necessary, assign interfaces and sub-interfaces to bridge groups
2. Enable STP for each bridge group
3. Set the STP priority for each bridge group
These sections include spanning-tree configuration information:
• Default STP Configuration, page 8-8
• Configuring STP Settings, page 8-9
• STP Configuration Examples, page 8-10
Default STP Configuration
STP is disabled by default. Table 8-2 lists the default STP settings when you enable STP.
Table 8-2 Default STP Values When STP is Enabled
Setting Default Value
Bridge priority 32768
Bridge max age 20
Bridge hello time 2