When you use the subscriber command to configure IP subscribers on dynamic bridged Ethernet over static ATM 1483 interface columns to support RADIUS authentication, the subscriber command provides the subscriber’s authentication parameters. The static ATM 1483 subinterface acts as the authenticating layer that establishes a session with RADIUS and passes the subscriber’s locally configured username and password information to the RADIUS server.
However, if your router is running stateful SRP switchover (high availability), the use of the subscriber command in this configuration might suspend stateful SRP switchover on the router or prevent stateful SRP switchover from becoming active. To bypass this limitation, you can use the subscriber management application to configure IP subscribers on dynamic bridged Ethernet interfaces.