Method for preventing user side loop network on digital user line concentrator

Abstract

A method for preventing user side ring network from line concentrator of digital user includes using line concentrator of digital user to send ring network monitoring message to user side at set time and to receive ring network monitoring message sent from user side, making port received said ring network monitoring message be blocked-state when that ring network is existed at user side is confirmed by said line concentrator according to received configuration information in ring network monitoring message and when priority level of said concentrator is not greater than priority level of message sending source.

Description

technical field [0001] The invention relates to a digital subscriber line (DSL) technology in the field of communication, in particular to a method for preventing user side ring network on a digital subscriber line concentrator. Background technique [0002] In the broadcast-based Ethernet, if there is a loop, the message will continue to circulate and proliferate in the loop, causing network congestion, and the looping of the message will also cause a learning error on the switch port, thus destroying the switch. port-address correspondence table, causing forwarding errors. As shown in Figure 1, for the sake of simplicity, it is assumed that all ports of all switches are in the same virtual local area network (VLAN), and ports P2 and port P3 of Ethernet switch A are connected to the same switch B through a network cable to form a loop. If terminal PC1 wants to send a message to terminal PC2, the message enters switch A through port P1, and enters switch B through port P2 a...

AI Technical Summary

Problems solved by technology

[0008] 1. The link layer of ADSL is based on Asynchronous Transfer Mode (ATM), and Ethernet frames carried on ATM cells must be specially processed

[0009] 2. The general Ethernet switch port is relatively small, ranging from dozens to hundreds, while the number of ports supported by mainstream DSLAM has reached thousands. The application of STP protocol on each port will have a great impact on the forwarding efficiency

[0010] 3. The private network switch connected by RTU may also enable the STP protocol. If the priority of the user switch is higher than that of the public network switch, it will not only interfere with the convergence of the spanning tree of the public network, but also in the event of a ring network. Sometimes, because the port priority of the public network switch is low, the port connecting the public network switch to the DSLAM will be blocked, resulting in the interruption of the entire DSLAM service.

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