Method for realizing Ethernet and frame-relay Internet and protocol conversion device

Abstract

The present invention discloses a method for interconnection between Ethernet and frame relay and a protocol conversion apparatus. The method is suitable for a protocol conversion apparatus which connects with CE by Ethernet interfaces and connects with PE by frame relay FR interfaces, so that the CE accesses Internet by PE. The protocol conversion apparatus performs the following steps: establishing one-to-one mappings between Ethernet interfaces connecting with CE and FR interfaces connecting with PE; constructing Ethernet link encapsulation head and FR link encapsulation head for each mapping, and correlating the encapsulation heads with corresponding mappings; recognizing the mapping of a received data message by its input interface, carrying out direct conversion of link layer encapsulation by corresponding FR link encapsulation head or Ethernet link encapsulation head, and forwarding from outlet interface of the mapping. The invention is not limited by networking mode, saves management and maintenance cost, network resource and bandwidth, as well as has high forwarding performance.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method and a protocol conversion device for realizing interconnection between Ethernet and frame relay. Background technique [0002] Network operator equipment (PE) often provides Internet access services for LAN users through a large number of TDM (Time Division Multiplexing) links. The link layer protocol of the TDM links is FR (Frame-Relay, Frame Relay ) protocol, wherein, as a simplified X.25 wide area network protocol, the FR protocol can provide multiple virtual circuits on a single physical transmission link. [0003] At the same time, the local area network user equipment (CE) performs Ethernet access through the Ethernet link, and its link layer protocol is the local area network protocol Ethernet. [0004] It can be seen that in order to realize the Ethernet service of LAN users, the mutual conversion between the FR protocol and the Ethernet protocol m...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) The biggest problem with this method is that it has relatively large restrictions on the networking method: it can only realize multiple remote network devices accessing a central server at the same time, and cannot realize one or more remote network devices. The device accesses multiple central servers at the same time; (2) The cost of management and maintenance is relatively high: the central server needs to assign a virtual MAC address to each accessed remote network device, and needs to perform corresponding configuration on itself and the protocol converter at the same time , so that when there are N remote network devices that need to access a central server at the same time, it is necessary to configure N entries on the protocol converter and N static ARP entries on the central server; (3) Not applicable through the operator Provided access equipment to access the Internet: Since the central server and protocol converter are required to be configured at any time according to needs, this method is only suitable for applications such as communication between the branch and the headquarters of the same company

[0013] To sum up, the prior art does not provide a relatively complete solution for realizing the interconnection between Ethernet and Frame Relay

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