The invention discloses a method of obtaining broadband user access port information for broadband access server, comprising: judging legality of a request message; resolving user media access control address from the request message and finding port information in the related list terms of IP digital user line access multiplexer switching chip: when finding no corresponding port information, sending virtual broadband access server response message indicating failure reason to the broadband access server; judging the attributes of the found port: if the port is cascaded port, transmitting virtual broadband access server request message to the corresponding IP digital user line access multiplexer connected with the cascaded port according to media access control address and IP address information configuring cascaded equipment on the cascaded port, and recording the information into virtual broadband access server agent list terms. And it makes the actual networking more flexible and has advantages of low cost, high flexibility, etc. |