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Cannot login to the Cisco Catalyst 6500 Series switch, and the RADIUS authentication server cannot authenticate users
This issue occurs due to the presence of Cisco bug ID CSCse02550.
On the Supervisor 720B in the Cisco Catalyst 6509 Switch, users try to login to the switch through authentication against a Remote Authentication Dial-In User Service (RADIUS) server. The RADIUS server is located on the inside interface of the switch. The setup works fine for the Terminal Access Controller Access Control System (TACACS) server on the Cisco 7206VXR Router. However, per virtual route forwarding (per-VRF) TACACS support is not in the Cisco Catalyst 6500 software.
The per-VRF RADIUS is supported in Cisco Catalyst 6500 software.
As a workaround, configure the RADIUS source-loopback in global configuration mode rather than as part of the authentication server group.