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Double stack compatible router searching device supporting access control listing function on core routers

An access control list, core router technology, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve the problem of reducing the utilization rate of CAM storage space

Inactive Publication Date: 2007-07-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has an obvious disadvantage. Before the specific distribution of the address prefix length is not known accurately, in order to ensure that N prefix entries can be stored, each CAM needs space for N entries. Therefore, the CAM storage space The utilization rate of

Method used

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  • Double stack compatible router searching device supporting access control listing function on core routers
  • Double stack compatible router searching device supporting access control listing function on core routers
  • Double stack compatible router searching device supporting access control listing function on core routers

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Experimental program
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Embodiment Construction

[0096] The implementation of the dual-stack compatible route finder that supports the access control list function in the core router is mainly completed on the line interface card. This part of the function is completed by a piece of FPGA named PPM with a set of TCAM and a set of SRAM chips.

[0097] (1), PPM and peripheral chip connection relationship.

[0098] PPM is the abbreviation of Packet Preprocessing Module, which means "packet preprocessing circuit component". The main function of this circuit component is to extract the IP packet header and analyze and process it. PPM receives the data packet received from the high-speed network interface, processes the packet type, extracts the information required for routing search and ACL filtering and sends it to TCAM The system searches. PPM receives the search result returned by the TCAM system (TCAM+SRAM), and decides the processing method of the IP packet (discarding, forwarding or handing over to the CPU) according to th...

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Abstract

This invention relates to core router supportive visit and control sequence double shed compatible router finding device, which belongs to Internet core router hardware technique field. The invention is characterized by comprising package pre-process circuit element and parallel CAM and SRAM and forms one router and ACL list through TCAM system and supports the list items dynamic alignment. The package pre-process circuit elements receive the data package and process them and extract needed information and ACL filtered information and send to the TCAM system and decide package process means according to the requirement results.

Description

technical field [0001] A dual-stack route finder with access control list function in a core router belongs to the technical field of the Internet backbone network core router. Background technique [0002] Today's high-end routers on the market are basically route finders implemented using network processing chips and TCAM. The specific implementation methods of each manufacturer are different. Some use custom-made ASIC chips, some use NP chips, and some use FPGAs. For example, Harbor Company's NetHammerG series routers are implemented using NP combined with TCAM technology, and TCAM chips provide 9M capacity. [0003] FPGA (Field Programmable Gate Array) is a large-scale programmable digital integrated circuit device that began to be used in the late 1980s. It makes full use of computer-aided design technology for device development and application. With the help of computers, users can not only design ASIC chips by themselves, but also perform function simulation and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L45/74
Inventor 赵有健关洪涛吴建平张小平乐祖晖
Owner TSINGHUA UNIV
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