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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Configuring the Wireless Device
Upgrading to Cisco Unified Software
Configuring the Access Point in Hot Standby Mode
In hot standby mode, an access point is designated as a backup for another access point. The standby
access point is placed near the access point that it monitors and is configured exactly like the monitored
access point. The standby access point associates with the monitored access point as a client and sends
Internet Access Point Protocol (IAPP) queries to the monitored access point through the Ethernet and
radio ports. If the monitored access point fails to respond, the standby access point comes online and
takes the monitored access point’s place in the network.
Except for the IP address, the standby access point’s settings should be identical to the settings on the
monitored access point. If the monitored access point goes off line and the standby access point takes its
place in the network, matching settings ensure that client devices can switch easily to the standby access
point. See Hot Standby Access Points at Cisco.com for more information:
http://www.cisco.com/en/US/docs/routers/access/wireless/software/guide/RolesHotStandby.html.
Upgrading to Cisco Unified Software
To run the access point in Cisco Unified mode, upgrade the software by following these major steps:
• Preparing for the Upgrade, page 255
• Performing the Upgrade, page 256
• Downgrading the Software on the Access Point, page 257
• Recovering Software on the Access Point, page 257
Software Prerequisites
• Cisco 1941W ISRs are eligible to upgrade to Cisco Unified software, if the router is running IP Base
feature set and Cisco IOS Release 15.0(1)M.
• To use the embedded access point in a Cisco Unified Architecture, the Cisco wireless LAN
controller (WLC) must be running version 5.1 or later.
Preparing for the Upgrade
Perform these tasks to prepare for the upgrade:
• Secure an IP Address on the Access Point, page 255
• Prior to the Upgrade, page 256
Secure an IP Address on the Access Point
Secure an IP address on the access point so it can communicate with the WLC and download the Unified
image upon boot up. The host router provides the access point DHCP server functionality through the
DHCP pool. Then the access point communicates with the WLC and setup option 43 for the controller
IP address in the DHCP pool configuration. The following is a sample configuration:
ip dhcp pool embedded-ap-pool
network 60.0.0.0 255.255.255.0
dns-server 171.70.168.183
default-router 60.0.0.1
option 43 hex f104.0a0a.0a0f (single WLC IP address(10.10.10.15) in hex format)
int vlan1
ip address 60.0.0.1 255.255.255.0
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