All things related to multicast

[Alan Crosswell <>]

Thanks, Rich.  Here's the updated list:

Meru - Debbie Fligor, Paul Roberts
Aruba - Doug Wilkinson
Cisco - Paul Roberts, Alan Buxey
HP ProCurve - Matt Davy
Trapeze - Rich Ingram
Ruckus - anybody have contacts? Simon Lockhart recommends talking to them.

/a

Richard N. Ingram wrote:
> Hello-
> 
> I would be happy to take this up with Trapeze.  We are just beginning
> our implementation and have already talked to them a bit about multicast.
> 
> Best regards,
> Rich
> 
> 
> Alan Crosswell wrote:
>> Thanks to everyone for volunteering.  What I have so far is:
>>
>> Meru - Debbie Fligor (Columbia uses Meru, so let me know if I can help)
>> Aruba - Doug Wilkinson
>> Cisco & Meru - Paul Roberts
>> HP ProCurve - Matt Davy
>> Ruckus - anybody have contacts? Simon Lockhart recommends talking to
>> them.
>>
>> This is a good start.
>>
>> /a
>>
>> Alan Crosswell wrote:
>>  
>>> At the last Joint Techs, we discussed that now that we had IP multicast
>>> on wired networks all figured out(;-), it was time to start over from
>>> scratch with IP multicast over WiFi.  The following rough notes
>>> collected some of the questions to send to WiFi vendors to get their
>>> responses.  I'm hoping some of you will volunteer to:
>>>
>>> a) Review these questions and improve upon them.
>>> b) Fill in the answers where you know them.
>>> c) Contact your WiFi vendor(s) and ask them to respond to the questions
>>> d) Report back to the group with your findings.
>>>
>>> Please let me know if you can help with this.
>>>
>>> /a
>>>
>>> WiFi Multicast
>>>
>>> driven by apps: iTunes sharing, zattoo, arootz, IPTV, etc.
>>>
>>> Problems:
>>>
>>> - flooding to all APs serving an SSID since there's no snooping.
>>> - multicast sent at broadcast base rate (1 Mbps) to ensure all listeners
>>> hear it
>>> - unicast tunnels between lightweight APs and controller replicate
>>> traffic
>>>
>>> ... and some hope or workarounds:
>>>
>>> - IPv6 support requires multicast
>>> - several vendors coming out with IGMP(MLD) snooping to:
>>>   - distribute between controller and APs
>>>   - limit traffic to only APs that have receivers associated
>>> - some vendors using known state of slowest multicast receiver to
>>> dynamically set the broadcast base rate.
>>>
>>> Questionnaire for vendors:
>>>  - please improve on these questions
>>>  - please volunteer to take to your vendor (or potential vendors) and
>>> report back to the group
>>>
>>> - How is multicast sent to AP from the controller?
>>> - Is multicast flooded to all APs in the SSID or just to AP with
>>> interest?
>>> - Is IGMP snooping implemented?  What version(s)?
>>> - What about IPv6?  IPv6 requires multicast.
>>> - Is MLD snooping implemented?
>>> - Can multicast base rate be set higher than the broadcast rate?  What
>>> are the limitations?
>>> - How does multicast work w/WPA2 security?  Broadcast group key?
>>> Multiple unicast?
>>> - How does this work with 802.11n multipath?
>>> - Is multiple unicast better due to retransmissions at 802.11 layer?
>>>
>>>     
>