Method and system for realizing cross-protocol failover

The invention discloses a method for realizing cross-protocol failover, which comprises the following steps that: the working state of a Diameter Server is detected; and when the Diameter Server is in a normal working state, an AAA system executes charging operations between the AAA system and the Diameter Server; when the Diameter Server fails to work, the AAA system executes charging operation between the AAA system and the Radius Server. The invention also discloses a system for realizing cross-protocol failover. The method and the system can improve the stability of a charging system, avoid system unavailability caused by the failed new charging system in the initial update stage and improve the experience degree of users.