All things related to multicast

[Dan Pritts <>]

On Mon, May 22, 2006 at 11:12:16AM -0700, Joel Jaeggli wrote:
> Modern (eg in the last 10 years) ethernet chipsets have a decent enough
> multicast filter down in the cam to drop quite a few Mb of multicast
> without noticing. So that leaves 1/2 duplex network segments (who cares)
> really big broadcast domains (better subnetting), wireless edge networks
> (which switch packets in software and can be configured to drop them
> just as easily as forward them them), and legacy devices.

less than two years ago i had problems with a cisco IP phone puking
(defined as very poor voice quality) when exposed to <10 megabits
of multicast traffic.

More recently i've heard complaints from a user with a sip softclient
on a mac powerbook when exposed to unsnooped v6 multicast (not sure
how much bandwidth was used).

Next, when you start talking moderately high-bandwidth applications
like dvts, these might be reasonable things to put on your network but
flooding two 30 megabit streams could start to cause real problems even
with better-behaved devices.

danno
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dan pritts - systems administrator - internet2
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