Specifications

Cisco Unified Wireless IP Phone 7921G Series Deployment Guide 67
Configuring TKIP Countermeasure Holdoff Time
TKIP countermeasure mode can occur if the Access Point receives two message integrity check (MIC) errors within a 60
second period. When this occurs, the Access Point will de-authenticate all TKIP clients associated to that 802.11 radio and
holdoff any clients for the countermeasure holdoff time (default = 60 seconds).
To change the TKIP countermeasure holdoff time on the Cisco Unified Wireless LAN Controller, telnet or SSH to the
controller and enter the following command:
(Cisco Controller) >config wlan security tkip hold-down <nseconds> <wlan-id>
For the autonomous Access Point, enter the time in seconds to holdoff clients if a TKIP countermeasure event occurs.
Interface dot11radio X
countermeasure tkip hold-time <nseconds>
For more information about these topics, refer to the Enterprise Mobility Design Guide at this URL:
http://www.cisco.com/en/US/docs/solutions/Enterprise/Mobility/emob41dg/eMob4.1.pdf
VLANs and Autonomous Access Points
Segment wireless voice and data into separate VLANs.
When using autonomous access points, use a dedicated native VLAN. Autonomous access points use Inter-Access Point
Protocol (IAPP), which is a multicast protocol.
For the native VLAN, it is recommend not to use VLAN 1 to ensure that IAPP packets are exchanged successfully.
Ensure that Public Secure Packet Forwarding (PSPF) is not enabled for the voice VLAN as this will prevent clients from
communicating directly when associated to the same access point. If PSPF is enabled, then the result will be no way audio.
The network ID in the SSID configuration, should only be disabled if Layer 3 mobility is enabled where the Wireless LAN
Services Module (WLSM) is deployed.
Configuring the Cisco Unified Wireless IP Phone 7921G
There are three methods for configuring network settings on the Cisco Unified Wireless IP Phone 7921G:
Configuring Phones with the Keypad
The network profiles can be configured by navigating to Settings > Network Profiles.
It may be required to unlock the screen by pressing **#.
For more information, refer to the “Configuring Settings on the Cisco Unified Wireless IP Phone 7921G” in the
Cisco Unified Wireless IP Phone 7921G Administration Guide at this URL:
http://www.cisco.com/en/US/products/hw/phones/ps379/prod_maintenance_guides_list.html