All things related to multicast

[pavan_kurapati <>]

For igmp v2, some devices implement a feature called "Fast Leave". This will 
make the router/switch to track each host in the subnet which joins a given 
stream and will be able to remove the membership if the last member leaves 
(instead of waiting for the timeout of group specific query). 

Regards,
Pavan

________________________________________
From: Alan Crosswell 
[]
Sent: Tuesday, January 20, 2009 7:27 PM
To: Julian Y. Koh
Cc: 
<>
Subject: Re: Script to Count Clients Watching Multicast MPEG2 Stream

The stats from routers will miss all but the first joiner on a subnet
with IGMPv2. In the case of, for example, a dorm this could
significantly undercount.

I believe that IGMPv3 will track all the members. If you are able to
run v3 (modern IGMPv3 snooping switches) then you might as well use
SSM too:-)
/a

On Jan 20, 2009, at 8:20 AM, "Julian Y. Koh"
<>
 wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> At 19:08 -0500 1/19/2009, Richard Mavrogeanes wrote:
>> I think the most reliable (and certainly the easiest) way to count
>> viewers
>> is to embed the view in a web page and count web hits. This can be a
>> sophisticated or simple as you wish.
>>
>
> That only gives you the number of hosts that loaded the web page.
> What the
> described stats give you is the number of computers that are
> actually tuned
> in and receiving the content.
>
>
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>
> --
> Julian Y. Koh
> <mailto:>
> Network Engineer                                   <phone:
> 847-467-5780>
> Telecommunications and Network Services         Northwestern
> University
> PGP Public Key:<http://bt.ittns.northwestern.edu/julian/
> pgppubkey.html>
>
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