Cisco CP-7911G Administration Guide - Page 235

Chapter 9 Troubleshooting and Maintenance Troubleshooting Cisco Unified IP Phone Security Table 9-1 Cisco Unified IP Phone Security Troubleshooting (continued) Problem Possible Cause 802.1X Not Enabled Phone cannot obtain a DHCP-assigned IP address. Phone does not register with Cisco Unified Communications Manager. These errors typically indicate that 802.1X is not enabled on the phone. To enable it, see the "Security Configuration Menu" section on page 4-38. Phone status display as "Configuring IP" or "Registering". 802.1X Authentication Status displays as "Disabled". Status menu displays DHCP status as timing out. Factory Reset Deleted 802.1X Shared Secret Phone cannot obtain a DHCP-assigned IP address. Phone does not register with Cisco Unified Communications Manager. Phone status display as "Configuring IP" or "Registering." Cannot access phone menus to verify 802.1X status. These errors typically indicate that the phone completed a factory reset (see the "Performing a Factory Reset" section on page 9-23) while 802.1X was enabled. A factory reset deletes the shared secret, which is required for 802.1X authentication and network access. To resolve this issue, you have two options: • Temporarily disable 802.1X on the switch • Temporarily move the phone to a network environment that is not using 802.1X authentication When the phone starts up normally in one of these conditions, you can access the 802.1X configuration menus and re-enter the shared secret (see the "802.1X Authentication and Status" section on page 4-43). OL11954-01 Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.0 9-15