All things related to multicast

[Bruce Curtis <>]

On Dec 11, 2009, at 12:07 PM, Mike McBride (mmcbride) wrote:

> The most successful iptv over wifi today combines 11n with unicast over
> the air (multicast down to the edge then convert).

  That seems like a waste, the delivery over the air is a natural fit for 
multicast, all of the clients will hear the packet and the packet takes up a 
time slot whether it is unicast or multicast.

> 
> AMT could therefore be another good solution here although that means
> you are dealing another tunnel in addition to CAPWAP.
> 
> mike
> 
>> -----Original Message-----
>> From: wiedel 
>> [mailto:]
>> Sent: Friday, December 11, 2009 8:57 AM
>> To: 
>> 
>> Cc: Bob Gerdes; wg-multicast
>> Subject: Re: Multicast implementations on Wireless
>> 
>> Folks,
>>      I don't want to be a commercial here, but you might check out
>> Ruckus Wireless if you are doing IPTV.   They grew up in that space
> and
>> have just patented some multicast delivery systems for IPTV.
>> Apparently
>> in use at several hotels with success for HDTV as well as standard
> def.
>> www.ruckuswireless.com would be their home page.
>>      James
>> 
>> 
>> 
>> Greg Shepherd wrote:
>>> This seems like an ideal deployment scenario for AMT.
>>> 
>>> Greg
>>> 
>>> On Thu, Dec 10, 2009 at 1:15 PM, Bob Gerdes 
>>> <>
>> wrote:
>>>> Greetings,
>>>>   In previous exchanges, there have been discussions regarding
>>>> implementations of multicast on various wireless networks (one
> noted
>> below).
>>>> In another, folks were going to check with specific vendors.
>>>> 
>>>>   We are looking for any cases where multicast (especially
> multiple
>> IPTV
>>>> channels) has been implemented on a wireless network for mobile
>> users.
>>>> 
>>>>   In checking with different vendors, we had a conversation with a
>>>> distributor who is suggesting that wireless vendors are
> implementing
>> a
>>>> streaming service to redistribute a multicast stream. In another,
>> apparently
>>>> some folks have had some success with Aruba, but haven't gotten
>> followup
>>>> info yet. So, hopefully you might have some better experiences or
>> updates
>>>> since last year.
>>>>    Thanks for your considersation,
>>>>      Bob
>>>> 
>>>> Backgroud: our group is working with our TV group on an IPTV pilot
>> service
>>>> using VideoFurnace/Haivision servers. We have been working with our
>>>> networking group to get multicast working across campus. Our
>> Wireless group
>>>> uses Meru access points and BlueSocket for authentication and
>> policy, but
>>>> they have not been able to make progress with multicast on
> Wireless.
>> One
>>>> issue is that we would need to move the infrastructure to 802.11N
> or
>> better.
>>>> 
>>>> Bob Gerdes
>>>> Office of Instructional and Research Technologies (OIRT)
>>>> Rutgers, The State University
>>>> Phone: (732) 445-1438   Fax: 445-5539
>>>> 
>>>> On Wed, 15 Oct 2008, Alan Crosswell wrote:
>>>> 
>>>> Subject : Re: notes from BoF
>>>> 
>>>>> Multicast WG BoF Wed Oct 15, 2008
>>>>> 
>>>>> Items discussed follow:
>>>>> 
>>>>> * High bandwidth multicast over WiFi
>>>>> - no progress on getting any significant information from vendors
>> other
>>>>>  than the realization that there are a number of problems with
>>>>>  rate limiting, flooding, sending all multicast down tunnels to
>> APs, etc.
>>>>> - See Bruce's mail regarding Cisco APs and roaming.
>>>> 
> 


---
Bruce Curtis                         

Certified NetAnalyst II                701-231-8527
North Dakota State University