This document provides functional requirements for network solutions that support multicast over Virtual Private LAN Service (VPLS). It specifies requirements both from the end user and service provider standpoints. It is intended that potential solutions will use these requirements as guidelines. Kamite, et al.

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One of the main motivations behind Virtual Private LAN Service (VPLS) is its ability to provide connectivity not only among customer routers and servers/hosts but also among customer IEEE bridges. VPLS is expected to deliver the same level of service that current enterprise users are accustomed to from their own enterprise bridged networks or their Ethernet Service Providers.When customer edge (CE) devices are IEEE bridges, then there are certain issues and challenges that need to be accounted for in a VPLS network. The majority of these issues have been addressed in the IEEE 802.1ad standard for provider bridges and they can be leveraged for VPLS networks. This document extends the provider edge (PE) model described in RFC 4664 based on IEEE 802.1ad bridge module, and it illustrates a clear demarcation between the IEEE bridge module and IETF LAN emulation module. By doing so, it shows that the majority of interoperability issues with CE bridges can be delegated to the 802.1ad bridge module, thus removing the burden on the IETF LAN emulation module within a VPLS PE.

Absrracr-In Voice Trunking over ATM (VTOA) technology, the tandem is replaced by three components: Trunk Inter-Working Function (T-IWF), Control and Signaling Inter-Working Function (CS-IWF), and ATM Network. This new architecture calls for re-examination of the signaling channel delay issues, which are wellatudied and well-speded for TDM networks. In VTOA, the ATM network together with the inter-working functions act as a virtual tandem switching system, which is called "ATMbased distributed virtual tandem switching system." The aim is that the performance of ATM-based trunking network should be at least as good as TDM-based network. The eross-of8ce delay budget must be shared among the interworking mnctions and the ATM network. Hence, the t h e for the ATM network to establish a switched virtual connection (SVC) is stringent.In this paper, we propose a simple adaptive SVC caching scbeme to offload the high processing capaaty burden on ATM switches. After a SVC is established in a usual way for a call, it is not tom down after the conversation is over. Instead, it is kept alive for variable duration (i.e., delayed release) with the expectation that there would be another call request for the same terminating end office during tbat time. The caching duration is adaptively changed with call arrival rate and call setup delay in the ATM network in order to stay within the delay budget specified by the requirements. The adaptability and the convergence of the algorithm are also shown by extensive simulations related to practical scenarios.