8-9
Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-14209-01
Chapter 8 Configuring Spanning Tree Protocol
Configuring STP Features
The radio and Ethernet interfaces and the native VLAN on the access point are assigned to bridge group
1 by default. When you enable STP and assign a priority on bridge group 1, STP is enabled on the radio
and Ethernet interfaces and on the primary VLAN, and those interfaces adopt the priority assigned to
bridge group 1. You can create bridge groups for sub-interfaces and assign different STP settings to
those bridge groups.
Configuring STP Settings
Beginning in privileged EXEC mode, follow these steps to configure STP on the access point:
Ethernet port priority
128
Radio port path cost
33
Radio port priority
128
Table 8-2
Default STP Values When STP is Enabled (continued)
Setting
Default Value
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
interface { dot11radio
number |
fastethernet
number
}
Enter interface configuration mode for radio or Ethernet
interfaces or sub-interfaces.
The 2.4-GHz radio and the 2.4-GHz 802.11n radio is 0.
The 5-GHz radio and the 5-GHz 802.11n radio is 1.
The fast Ethernet interface is 0.
Step 3
bridge-group
number
Assign the interface to a bridge group. You can number your
bridge groups from 1 to 255.
Step 4
no bridge-group
number
spanning-disabled
Counteract the command that automatically disables STP for a
bridge group. STP is enabled on the interface when you enter
the
bridge
n
protocol ieee
command.
Step 5
exit
Return to global configuration mode.
Step 6
bridge
number
protocol ieee
Enable STP for the bridge group. You must enable STP on
each bridge group that you create with
bridge-group
commands.
Step 7
bridge
number
priority
priority
(Optional) Assign a priority to a bridge group. The lower the
priority, the more likely it is that the bridge becomes the
spanning-tree root.
Step 8
end
Return to privileged EXEC mode.
Step 9
show spanning-tree bridge
Verify your entries.
Step 10
copy running-config startup-config
(Optional) Save your entries in the configuration file.
