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【速搜问答】仿真局域网是什么

问答 admin 4周前 (04-10) 27次浏览 已收录 0个评论

汉英对照:
Chinese-English Translation:

仿真局域网又叫LAN 仿真 (LANE)允许异步传输模式 (ATM) 使用旧式网络和旧版本应用程序的一组软件组件。使用 LANE,您可以在 ATM 网络上运行传统局域网适用的应用程序和协议,而无需进行修改。

LAN emulation, also known as LAN emulation (Lane), allows asynchronous transfer mode (ATM) to use a set of software components of legacy networks and legacy applications. With lane, you can run applications and protocols applicable to traditional LANs over ATM networks without modification.

仿真局域网又叫 LAN 仿真 (LANE)允许异步传输模式 (ATM) 使用旧式网络和旧版本应用程序的一组软件组件。使用 LANE,您可以在 ATM 网络上运行传统局域网适用的应用程序和协议,而无需进行修改。

LAN emulation, also known as LAN emulation (Lane), allows asynchronous transfer mode (ATM) to use a set of software components of legacy networks and legacy applications. With lane, you can run applications and protocols applicable to traditional LANs over ATM networks without modification.

介绍

introduce

LANE 使得 ATM 协议层从表面看来象是一个覆盖协议和应用程序的以太网或令牌环局域网。LANE 提供了完全利用 ATM 和根本不使用 ATM 之间的一种中间步骤。

Lane makes the ATM protocol layer look like an Ethernet or token ring LAN covering protocols and applications. Lane provides an intermediate step between fully utilizing ATM and not using ATM at all.

ATM 定义的局域网仿真(LANE)技术为在 ATM 网络上传送现有的 LAN 协议创造了条件。采用 ATM 局域网仿真技术时,对原局域网用户来说,ATM 交换网络的各种功能(如呼叫建立、信元拆装等)都是透明的,原局域网终端的硬件和软件系统不需做任何改动,即可利用 ATM 网络提供的高速直达数据链路传送 LAN 协议包。

LAN emulation (Lane) technology defined by ATM creates conditions for the transmission of existing LAN protocols over ATM networks. When using ATM LAN simulation technology, all functions of ATM switching network (such as call setup, cell disassembly, etc.) are transparent to the original LAN users. The hardware and software system of the original LAN terminal does not need any changes, and can use the high-speed direct data link provided by ATM network to transmit LAN protocol packets.

概念

concept

LANE 的服务体系是基于 CLIENT/SERVER 的查询和响应模型。在一个仿真的局域网络(ELAN)中,需要配置局域网仿真客户机(LEC)、局域网仿真配置服务器(LECS)、局域网仿真服务器(LES)和广播/未知服务器(BUS)。LEC 是所仿真的局域网的端系统,它向现有局域网提供 MAC 层的服务接口,代理原局域网中的所有终端向 ATM 网络传输数据,完成地址解析,实现整个 ELAN 中的所有终端间的通信。LECS 负责保存仿真局域网中的局域网仿真客户机(LEC)配置信息,并向新安装的 LEC 发送 LES 的 ATM 地址,每个管理域只有一个 LECS,它可为一个或多个仿真局域网(ELAN)提供服务。LES 负责实现 MAC 地址与 ATM 地址的映射功能,每个 ELAN 只有一个 LES,每个 LES 有一个专有的 ATM 地址来标识。BUS 负责处理广播及未知的 MAC 地址,在仿真局域网内提供广播和组播传送功能。

The service system of lane is based on the query and response model of client / server. In a simulated local area network (Elan), it is necessary to configure the local area network simulation client (LEC), local area network simulation configuration server (LECs), local area network simulation server (LES) and broadcast / unknown server (bus). LEC is the end system of the simulated LAN. It provides the service interface of MAC layer to the existing LAN, transmits data to ATM network on behalf of all terminals in the original LAN, completes address resolution, and realizes the communication between all terminals in the whole elan. LECs is responsible for saving the configuration information of local area network simulation client (LEC) in the simulation LAN, and sending the ATM address of LES to the newly installed LEC. Each management domain has only one LECs, which can provide services for one or more simulation LAN (Elan). Les is responsible for the mapping function between MAC address and ATM address. Each Elan has only one les, and each Les has a unique ATM address to identify. Bus is responsible for dealing with broadcast and unknown MAC address, and provides broadcast and multicast transmission function in simulation LAN.

LEC 是如何与 LES 进行通信完成地址解析并把用户数据通过 ATM 数据直达链路传送给另一个真地址解析协议(LE-ARP)请求,询问收端的 ATM 地址。如果收端已在 LES 上注册,则 LES 就在 LE-ARP 应答中将收端 ATM 地址返回给发 ARP 请求转发给 ELAN 上的所有 LEC,收端 LEC 收到该请求后,就在 LE-ARP 应答中将自己的 ATM 地址返回给 LES,再由 LES 返回就通过 ATM SVC 呼叫建立到收端的虚连接,并在其上进行数据传送。

How does LEC communicate with LES to complete address resolution and send user data to another true address resolution protocol (le-arp) request through ATM data direct link to ask the ATM address of the receiving end. If the receiving end has registered with les, Les will return the ATM address of the receiving end to all LECs on Elan in the le-arp response. After receiving the request, the receiving end LEC will return its ATM address to les in the le-arp response, and then Les will return it to establish a virtual connection to the receiving end through ATM SVC call, and carry out data transmission on it.

LANE 对局域网从 MAC 层进行仿真,屏蔽了网络层以及其上的高层协议,从而使 ATM 网络可以支持多种协议的传送。这既是它的优点,也是它的缺点。优点是为 LAN 用户的互连创造了便利条件,缺点是无法利用 ATM 的多业务及相应的特性,网络层的 QOS(如 IP 协议中的 RSVP)也无法对应到 ATM 交换结构中,同时由于最大帧大长度的限制,网络规模的扩展也受到限制;而且两个 ELAN 内的用户进行通信时要经过路由器,仍不能完全解决路由器瓶颈问题;最后,一个 ELAN 目前只能同时仿真一种局域网,不能完成异种局域网的转换问题。

Lane simulates the local area network from the MAC layer, shielding the network layer and its high-level protocols, so that the ATM network can support the transmission of multiple protocols. This is both its advantages and disadvantages. The advantage is that it creates convenient conditions for LAN users to interconnect. The disadvantage is that it can’t make use of ATM’s multi service and corresponding characteristics, and the QoS of network layer (such as RSVP in IP Protocol) can’t be corresponding to ATM switching structure. At the same time, due to the limitation of the maximum frame length, the expansion of network scale is also limited Finally, an Elan can only simulate one LAN at the same time, and can not complete the conversion of Heterogeneous LAN.


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