All things related to multicast

["Richard Mavrogeanes" <>]

Flooding in a campus is bad.  Very bad. While one could say "it shouldn't", 
it does affect PC's, printers, and VLANs that have been carved out for 
special treatment.   I know of no enterprise/campus network with GigE to 
every desktop or printer, so I think its a huge issue that will all but 
prevent IPV6 multicast from going anywhere untill affordable 8, 16, 32 port 
switches won't flood.  
 
Do such things exist?
 
For what it's worth, the US DoD pretty much mandates "IPV6", but such mandate 
does not seem to mandate multicast, so I fear infrastructure vendors won't 
support MLD snooping.  Do we believe popular switches will be firmware 
upgradeable to support MLD?
 
/rich
 
 
 

        -----Original Message----- 
        From: Pekka Savola 
[mailto:]
 
        Sent: Sat 5/20/2006 2:06 PM 
        To: Richard Mavrogeanes 
        Cc: Alan Crosswell; 

 
        Subject: RE: IPV6 Multicast
        
        

        On Sat, 20 May 2006, Richard Mavrogeanes wrote:
        > Well, the next release supports IPV6, and perhaps multicast too.
        >
        > The trouble/question is local Ethernet switch support ("snooping"
        > behavior), and I'm hoping someone has some war stories to share.  
It was
        > bad enough getting the switch vendors fully onboard with IGMP, and I
        > wonder where they are with IPV6 multicast.  Obviously, IPV6 is not 
so
        > useful if it can't reach the end user (desktop).
        
        Well, IPv4 IGMP snooping should NOT block IPv6 multicast.  If it 
does, the
        implementation is buggy.
        
        However, some network administrators might not appreciate flooding 
the LAN
        with v6 multicast either, but with gigabit networks, at least that 
isn't a
        big issue for us (which is why we haven't been pushing MLD snooping 
hard
        in our CFP's).
        
        >       -----Original Message-----
        >       From: Alan Crosswell 
[mailto:]
        >       Sent: Sat 5/20/2006 12:54 PM
        >       To: Richard Mavrogeanes
        >       Cc: 

        >       Subject: Re: IPV6 Multicast
        >
        >
        >
        >       Abiline and most of the gigapops support it.  There are some 
issues with
        >        some international networks not yet support embedded RP.  
Campuses are
        >       pretty far behind.  NYU is one of the few that has done v6 
multicast
        >       with NYSERNet.  In the first ever v6 multicast hands on 
workshop in
        >       Albuquerque a few months ago, we viewed content that was 
being multicast
        >       from Syracuse.
        >
        >       Put it in a product and I'll have an excuse to replace my 
Vbrick 1200's:-)
        >
        >       /a
        >
        >       Richard Mavrogeanes wrote:
        >       > I'd like to explore this group's experience with IPV6 
multicast, in particular, what do we believe is the current state of the 
Internet2 backbone network and what do we think is the state of enterprise 
routers and switches to allow it?
        >       >
        >       > Looking forward to an interesting thread...
        >       >
        >       > /rich
        >       >
        >
        >
        >