Adaptation method in use for syncretizing Internet and synchronous digital hierarchy (SHD) or synchronous optical network

Abstract

New layer of data link layer protocol - data link procedure (DLP) is introduced between IP of network layer and SDH/SONET in physical layer in the invention to realize syncretizing adaptation between Internet and SDH/SONET in order to overcome shortage of current adaptation technique. The method possesses features are: high efficiency of forwarding IP packets, safety and reliability, flux engineering capability, 50 ms protected rearrangement function, realizing exchange between SDH/SONET circuit of virtual container and optical wavelength directly, and realizing compatibility between 1Pv4 and IPv6 networks and compatibility to packet voice network. Using safety mechanism, network control management mechanism, flow management mechanism provided by DLP realizes safety management, control management and flow management for IP network. The method makes current IP network transits to united public network in next generation smoothly.

Description

technical field The present invention relates to the data transmission field of the Internet, which is an adaptation method for the fusion of Internet Protocol (abbreviated as IP) and Synchronous Digital Hierarchy (abbreviated as SDH) or Synchronous Optical Network (abbreviated as SONET). Used for various routers (core or high-end switching routers, edge or aggregation switching routers, access switching routers), various high / medium / low-end Ethernet switches based on packet (packet) switching, and multi-service transmission platforms (English abbreviation MSTP), user-side integrated access equipment, and any interconnection and intercommunication equipment related to the Internet. Background technique According to the relevant information, there are several ways to realize the adaptation between the Internet and the Synchronous Digital Hierarchy or Synchronous Optical Network (SDH / SONET) at present: (1) Adopt "point-to-point protocol" (abbreviated as PPP) plus "advanced ...

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Problems solved by technology

(2) Although the SDH / SONET network provides the network protection switching function, since the IP network uses the routing protocol to forward the IP packet according to the destination IP address in the IP packet, even if the SDH / SONET network provides a powerful Network switching protection function, but the IP network using the above three adaptation methods must also recalculate the route, which may cause packet loss on the one hand, and on the other hand, if IP is used to carry important services such as real-time services, due to the switching of the IP network The time is actually within a few seconds, so it is difficult to meet the requirements of real-time business

(3) Since the IP network uses two types of routing protocols, namely, the interior gateway protocol and the exterior gateway protocol to realize the routing selection of IP packets, this method has no traffic engineering capability, which may result in even if there are multiple connection links between two nodes. However, the IP network may forward all IP packets to a link and transmit them through a link, causing congestion on this link, resulting in packet loss, while the other link is in an idle state.

(4) Since the above three adaptation methods do not perform any service classification on data services, everyone is the same and has the same priority, resulting in no quality of service guarantee for this IP network

(5) Since these three adaptation methods use point-to-point connection processing, and each data packet must be processed, if the network is an all-optical network, then a series of optical-electrical-optical conversion processing must be performed, All-optical switching cannot be realized, especially for dense wavelength division multiplexing systems using SDH frame structure, optical wavelength switching cannot be realized, and direct switching of virtual containers or synchronous transfer mode granular circuits cannot be realized

(6) For the first and second adaptation methods that adopt PPP+HDLC and LAPS, since HDLC frames and LAPS frames use specific bytes (0X7E) to realize frame delimitation, IP packets need to be transparently processed. There are two defects in this method, one of which is network security. If those malicious people set all the payload information to the specific two bytes (0X7D, 0X7E), then this will double the network traffic , if a joint attack is used, it may lead to network congestion; second, since these two adaptation methods have no error correction function, if the frame delimitation byte is wrong, it may cause packet loss

(7) The IP network using the above three adaptation methods has no security at all

(9) In the network using the above adaptation method, the traditional voice service is separated from the IP network service, but now it is generally believed that the unified public network will adopt packet switching technology in the future. , so that the integration of packetized voice services and IP networks is of no help

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