Answer Posted / shankha subhra ghosh

Using Multicast addressing to limit WAN traffic
The DACS and Model Builder can be used to limit the amount
of traffic that would be put out over a wide area network.
This is useful if you have a facility with several systems
and not all of the voice traffic needs to go out over the
WAN. Voice traffic can consume quite a bit of bandwidth (64
Kbits/sec per mulaw or 16 Kbits/sec per CVSD voice stream)
and unecessary voice streams on a WAN could cause potential
bottlenecking problems.
The idea is really quite simple, voice streams passed
through the router onto the WAN will have DIS exercise
numbers corresponding to multicast groups that are in use
all across the WAN. For local voice traffic multicast groups
are formed locally but no IGMP reports are submitted to the
router for these groups, therefore they never get passed
through. The DACS on the local network however can process
these packets and permit voice communications.
The DIS exercise number is used as a discriminator to
determine if voice is passed over the WAN. For radios having
DIS exercise numbers below the cutoff point, IGMP reports
are submitted, for radios having DIS exercise numbers above
the cutoff point no IGMP reports are published.

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