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Title : Multicast Forwarding Equivalence Class [MFEC]
Author(s) : F. Guo
Filename : draft-guo-mboned-mfec-framework-01.txt
Pages : 12
Date : 2007-12-27
At present, the multimedia services such as IPTV are gaining
importance. Multicast technologies play an inevitable role in these
multimedia services.
The main factors affecting the multicast technologies are the
convergence speed and the capacity of the multicast routing table.
One of the easiest and the most commonly practiced methods in
nowadays multicast deployment is to push the data to the end router
by static configurations (igmp static group). This will reduce the
delay in channel switching. The data flow of multiple channels from
one or several servers are transmitted along the distribution tree.
The distribution tree for multiple channels may be composed of only
one same distribution tree. A router, however, maintains separate
protocol-status and provides separate protocol-packets content for
each channel. This prolongs the route convergence, increases the
status-space and reduces the exchange rate of protocol-packets.
This document proposes a solution to speed up the route convergence,
reduce the states in the multicast forwarding table and increase the
exchange rate of packets. This can be achieved by using the same
state for the data flows that passes the same path in the
distribution tree. This same state is called Multicast Forwarding
Equivalent Class (MFEC). In other words, MFEC is a group of multicast
packets that are forwarded over the same path with the same traffic
handling treatment. This solution extends various multicast protocols
such as PIM- SSM, PIM-SM, Bidir-PIM, PIM-DM and DVMRP, and perfects
application of multicast.
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