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Cisco Wireless LAN Controller Configuration Guide
OL-17037-01
Chapter 4 Configuring Controller SettingsWireless Device Access
Configuring Cisco Discovery Protocol
Caution
We recommend that you not use the low latency MAC feature if you are using the 1140, 1250, 1260, and
3500 series access points that are based on the Marvell platform. If used, the data packets are retried at
the data rate specified multiple times without downshifting the rates.
We also recommend that you not use the low latency MAC feature if you are using the 1120, 1130, 1230,
and 1240 series access points (not based on the Marvell platform). If used, the number of retries is
reduced to 3 with the first retry at the initial rate.
Step 4
To view the current status of MAC optimization for voice, enter this command:
show
{
802.11a
|
802.11b
}
Information similar to the following appears:
Voice-mac-optimization...................Disabled
To enable or disable MAC optimization for voice, enter this command:
config advanced
{
802.11a
|
802.11b
}
voice-mac-optimization
{
enable
|
disable
}
This feature enhances voice performance by controlling packet retransmits and appropriately aging out
voice packets on lightweight access points, thereby improving the number of voice calls serviced per
access point. The default value is disabled.
Step 5
To re-enable the radio network, enter this command:
config
{
802.11a
|
802.11b
}
enable
network
Step 6
To save your settings, enter this command:
save config
Configuring Cisco Discovery Protocol
Cisco Discovery Protocol (CDP) is a device discovery protocol that runs on all Cisco-manufactured
equipment. A device enabled with CDP sends out periodic interface updates to a multicast address in
order to make itself known to neighboring devices.
The default value for the frequency of periodic transmissions is 60 seconds, and the default advertised
time-to-live value is 180 seconds. The second and latest version of the protocol, CDPv2, introduces new
time-length-values (TLVs) and provides a reporting mechanism that allows for more rapid error tracking,
thereby reducing down time.
CDPv1 and CDPv2 are supported on the following devices:
•
2100 and 4400 series controllers
Note
CDP is not supported on the controllers that are integrated into Cisco switches and routers,
including those in the Catalyst 3750G Integrated Wireless LAN Controller Switch, the Cisco
WiSM, and the Cisco 28/37/38xx Series Integrated Services Router. However, you can use
the
show ap cdp neighbors detail
{
Cisco_AP
|
all
} command on these controllers in order
to see the list of CDP neighbors for the access points that are connected to the controller.
•
CAPWAP- enabled access points
