Patent ID: 8614943

Claim:
A method for protecting a subscriber access network, comprising: connecting a Broadband Network Gateway (BNG) device and N predetermined Digital Subscriber Line Access Multiplexers (DSLAMs) to an aggregation device (AGG); allocating an active BNG interface for each of the N DSLAMs, allocating a standby BNG interface set for the N DSLAMs to obtain a backup relationship, and sending the backup relationship to the AGG; and backing up subscriber data on the DSLAMs to the standby BNG interface set, so that when an active BNG interface fails, the AGG switches subscribers on a DSLAM served by the failed active BNG interface to a standby BNG interface in the standby BNG interface set, wherein N is a natural number; wherein allocating the standby BNG interface set for the N DSLAMs comprises: allocating a standby BNG interface for each of the N DSLAMs, wherein all the standby BNG interfaces allocated for the N DSLAMs serve as the standby BNG interface set; wherein backing up subscriber data on the DSLAMs to the standby BNG interface set comprises: backing up subscriber data on the DSLAM served by the active BNG interface to the allocated corresponding standby BNG interface; and wherein when the active BNG interface fails, the AGG switches subscribers on the DSLAM served by the failed active BNG interface to the standby BNG interface in the standby BNG interface set comprises: the AGG switches the subscribers on the DSLAM served by the failed active BNG interface to the allocated corresponding standby BNG interface when the active BNG interface fails, wherein the corresponding standby BNG interface serves as a new active BNG interface, and reallocating a new standby BNG interface for the new active BNG interface.