Introduction to Routing Seminar Topic:

This paper discussed about the importance of Routing and multicast routing scheme.  In an inter network, information passed from source to destination node through Routing, which is an important component of communication networks.   Due to limited wireless network bandwidth, energy resources and dynamic topology, multicast becomes the most challenging routing scheme in peer-to-peer or adhoc networks.  Multicast is hard in wired networks when compared to that of unicast routing scheme.


Multicast routing scheme supports many envisioned advanced applications like military operations, civil operations and disaster management in peer-to-peer networks.  Tree based and mesh-based are the two categories of adhoc multicast routing protocols.  Only one path exists between the source and receiver in tree based routing scheme.  Multiple redundant paths exist between the source and receiver in mesh-based routing scheme.  Proactive, reactive and hybrid are the three update mechanism categories in multicast routing protocols based on the adhoc routing information.  

In proactive protocol, nodes always evaluate routes to all reachable nodes and maintain consistent routing information.  The proactive protocol is also termed as table-driven protocol.  In reactive protocol, routing information is not maintained at the network nodes if communication is not exist.  The reactive protocol is also termed as on-demand routing.  In order to balance the delay and control overhead, the hybrid routing protocols exists as an advantage of both proactive and reactive routing protocols. In adhoc networks, this paper has compared two on-demand routing protocols like Multicast operation of Ad-hoc On-demand Distance Vector (MAODV) and On-Demand Multicast Routing Protocol (ODMRP) based on the corresponding routing performance.


This paper compares two on-demand routing protocols in adhoc network and analyzed the results based on the corresponding routing protocols performance. MAODV is a hard state reactive tree based routing and this protocol uses a broadcast route-discovery mechanism.  ODMRP  protocol is based on a mesh structure and connects the multicast members by using forwarding group nodes concept. ODMRP helps to create and maintain the multicast forwarding state.

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