A message processing method, characterized by comprising: receiving, by an access controller, a first message used to obtain Internet Protocol, IP, address information for a user-side device and a first access loop identifier of a first network node, wherein the first message and the first access loop identifier are sent by the first network node, the first access loop identifier is not carried in the first message; initiating, by the access controller, an authentication, authorization and accounting, AAA, message according to the first access loop identifier, wherein the AAA message comprises the first access loop identifier; and sending, by the access controller, the AAA message to an AAA server for authorization verification based on the first access loop identifier and a second access loop identifier of a second network node; wherein the AAA message further comprises the second access loop identifier of the second network node, the second network node and the first network node belong to a same data packet forwarding path; the initiating, by the access controller, an authentication, authorization and accounting AAA message according to the first access loop identifier comprises: determining, by the access controller, the second access loop identifier according to the first access loop identifier and a correspondence between the first access loop identifier and the second access loop identifier; and receiving, by the access controller, authorization information sent by the AAA receiving, by an access controller, a first message used to obtain Internet Protocol, IP, address information for a user-side device and a first access loop identifier of a first network node, wherein the first message and the first access loop identifier are sent by the first network node, the first access loop identifier is not carried in the first message; initiating, by the access controller, an authentication, authorization and accounting, AAA, message according to the first access loop identifier, wherein the AAA message comprises the first access loop identifier; and sending, by the access controller, the AAA message to an AAA server for authorization verification based on the first access loop identifier and a second access loop identifier of a second network node; wherein the AAA message further comprises the second access loop identifier of the second network node, the second network node and the first network node belong to a same data packet forwarding path; the initiating, by the access controller, an authentication, authorization and accounting AAA message according to the first access loop identifier comprises: determining, by the access controller, the second access loop identifier according to the first access loop identifier and a correspondence between the first access loop identifier and the second access loop identifier; and receiving, by the access controller, authorization information sent by the AAA determining, by the access controller, the second access loop identifier according to the first access loop identifier and a correspondence between the first access loop identifier and the second access loop identifier; and receiving, by the access controller, authorization information sent by the AAA