A Self-Repairing Tree Topology Enabling
Content-Based Routing in Mobile Ad Hoc Networks
Content-based routing (CBR) provides a powerful

and flexible foundation for distributed applications. The method of implicit addressing allows decoupling

among the communicating components. Thus, meeting the

needs of many dynamic scenario like the MANETS. Content-based routing (CBR) differs from classical routing only in the fact that
the messages are addressed based on their content instead of

their destination. Although it enables multi-point communication, CBR is not
simply multicast, but here in
CBR message consumers define their own message classes. In CBR, the

absence of an explicit and a priori definition of groups and the fact that every message can be addressed to a different
set of component makes them different from the multicast networks.

Motivation.
a form of implicit communication is allowed by the CBR that
breaks the coupling between senders and receivers. Senders no

longer need to determine the address of communication parties.

and the receivers do not know who is the sender of a message.

M ULTICAST A D -H OC O N -D EMAND D ISTANCE V ECTOR
(MAODV)
It is the multicast counterpart of the AODV protocol . Here , All nodes
belonging to the same multicast group, along with nodes (called
forwarders) required to forward messages among group members. The four kinds of messages used by the protocol are:
-Route request (RREQ):
a node willing to
join a specific multicast group, repair a branch of the tree,
or merge two network partitions broadcasts this message.
-Route reply (RREP):
To tell a a node that previously broadcast a RREQ to tell that its request is acknowledged.
-Multicast activation (MACT):
is unicast to explicitly ac-
tivate a particular route towards the multicast tree.

-Group hello (GRPH):
This message is is periodically broadcast by each
group leader and rebroadcast across the whole network.

For further details refer this pdf:

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