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Abstract:
Voice over IP technology integrates data and voice networks and offers flexibility by supplying device interoperability using standards-based protocols. Routing is an essential data networking function that provides an efficient real-time data delivery VoIP requires. Best-effort networks leverage Interior Gateway Protocol technologies to determine paths for routing packets between hosts. Architects for best-effort networks provide services by over-provisioning the links and routers so that network congestion does not introduce unwanted levels of latency, jitter, and packet loss. Route re-convergence can be detrimental to VoIP users in the middle of a conversation, as it impacts both latency and jitter. This paper studies how VoIP performance can be affected by different routing behaviors which include Routing Information Protocol, Open Shortest Path First and Enhanced Interior Gateway Routing Protocol. Network modeling and simulation have been carried out with OPNET Modeler to evaluate and compare performances.
Keywords: VoIP, Interior Gateway Protocols, RIPv1, OSPF, EIGRP, OPNET modeling and simulations.
1. Introduction
VoIP technology offers cost-saving solution for integrated data and voice network, which will soon take off as a viable alternative to traditional voice systems and public switched telephone networks (PSTN) [I]. VoIP is flexible in driving new services by supplying device interoperability using standards-based protocols. VoIP as a real-time application brings new challenges for service providers and enterprises. Networks need to be more intelligent, secure, and have a higher level of performance. When designing a network to support VoIP and real-time applications, such considerations as application requirements, available budget, quality of service requirements, and downtime ramifications, have to be taken into account. Best effort network design is one of the common approaches to support VoIP service.
Routing is an essential data networking function that provides an efficient real-time data delivery VoIP requires. Best-effort networks leverage Interior Gateway Protocol (IGP) technologies to determine paths for routing packets between hosts. IGP protocols are used within an autonomous system (AS) [2], which is described as a number of routers/network under single administrative control and share a common routing strategy. It is the largest entity within the internet hierarchy. Not all routing protocols understand AS, but the ones that do can control routes in and out of different autonomous systems, and set up network boundaries locking off different protocols or...