Definition - What does Multicast Router (mrouter) mean?
A multicast router sorts out the two kinds of of signaling packets, multicast and unicast. The multicast router then determines the distribution of the data to their intended destinations in the Multicast Internet, also known as Multicast Backbone or MBone. Mrouters use a combination of algorithms in order to quickly and efficiently initiate sending orders to the applicable switches to facilitate delivery of the data packets.
Multcast routers work in conjunction with unicast routers to make up the bigger Backbone. Multiple mrouters can be found together with unicast routers along the structure of the Backbone and will disguise multicast packets as unicast ones so that the unicast routers will accept them.
The data packets are passed to other multicast routers using the unicast routers as pathways or conduits. This process is called IP tunneling.
There are two protocols involved in multicast routing: dense-mode routing and sparse-mode routing. These protocols are used in distributing multicast packets. The protocol to be used depends on the available bandwidth and the different distributions of end-users across the network.
Dense-mode routing is used when there is a large number of end-users and the bandwidth is enough to cater them. Meanwhile, sparse-mode routing is used when there is limited bandwidth and end-users are thinly distributed.