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Cisco Wireless LAN Controller Configuration Guide
OL-17037-01
Chapter 3 Configuring Ports and Interfaces
Enabling Link Aggregation
Step 4
Enter one of these commands to configure the STP port path cost on the STP ports:
•
config spanningtree port pathcost
1-65535
{
port-number
|
all
}—Specifies a path cost from 1 to
65535 to the port.
•
config spanningtree port mode pathcost auto
{
port-number
|
all
}—Enables the STP algorithm to
automatically assign the path cost. This is the default setting.
Step 5
Enter
config spanningtree port priority
0-255
port-number
to configure the port priority on STP ports.
The default priority is 128.
Step 6
If necessary, enter
config spanningtree switch bridgepriority
0-65535
to configure the controller’s
STP bridge priority. The default bridge priority is 32768.
Step 7
If necessary, enter
config spanningtree switch forwarddelay
4-30
to configure the controller’s STP
forward delay in seconds. The default forward delay is 15 seconds.
Step 8
If necessary, enter
config spanningtree switch hellotime
1-10
to configure the controller’s STP hello
time in seconds. The default hello time is 2 seconds.
Step 9
If necessary, enter
config spanningtree switch maxage
6-40
to configure the controller’s STP maximum
age. The default maximum age is 20 seconds.
Step 10
After you configure STP settings for the ports, enter
config spanningtree switch mode enable
to enable
STP for the controller. The controller automatically detects logical network loops, places redundant
ports on standby, and builds a network with the most efficient pathways.
Step 11
Enter
save config
to save your settings.
Step 12
Enter
show spanningtree port
and
show spanningtree switch
to verify that your changes have been
saved.
Enabling Link Aggregation
Link aggregation (LAG) is a partial implementation of the 802.3ad port aggregation standard. It bundles
all of the controller’s distribution system ports into a single 802.3ad port channel, thereby reducing the
number of IP addresses needed to configure the ports on your controller. When LAG is enabled, the system
dynamically manages port redundancy and load balances access points transparently to the user.
Cisco 4400 series controllers support LAG in software release 3.2 and higher, and LAG is enabled
automatically on the controllers within the Cisco WiSM and the Catalyst 3750G Integrated Wireless
LAN Controller Switch. Without LAG, each distribution system port on the controller supports up to 48
access points. With LAG enabled, a 4402 controller’s logical port supports up to 50 access points, a 4404
controller’s logical port supports up to 100 access points, and the logical port on each Cisco WiSM
controller supports up to 150 access points.
Note
You can bundle all four ports on a 4404 controller (or two on a 4402 controller) into a single link.
illustrates LAG.
