N reasons for not deploying ipv6 (was: Re: [narten@us.ibm.com:PI addressing in IPv6 advances in ARIN])

Mohacsi Janos mohacsi at niif.hu
Wed Apr 19 12:12:22 CEST 2006

On Tue, 18 Apr 2006, Iljitsch van Beijnum wrote:

>> - IPv6 multicast support in edge switches - we're just beginning to get
>> IGMPv3 support in the latest products and there's enough IGMPv2 support
>> out there that we can envisage turning on IPv4 multicast most places
>> anyone needs it, though there are still significant islands of kit that
>> don't support it at all (switches running software whose release notes
>> are dated 1997, for instance).  It will be ~5-10 years before we could
>> think of having that stuff replaced with kit that's contemporary now.
> Are there any switches that support MLD snooping, by the way? (Not even 
> talking about MLDv2...) I haven't heard of this. Unfortunately, there are 
> multilayer switches that implement IGMPv2 and assume multicast for which they 
> don't see IGMP must be blocked, which is of course nonsense because you can't 
> send IGMP messages for non-IPv4 ethernet group addresses.
Yes. We tested Cisco 3750 MLD snooping - in a test version of IOS - a year 
ago - seemed to be worked.
The guide is here:


Janos Mohacsi
Network Engineer, Research Associate
Key 00F9AF98: 8645 1312 D249 471B DBAE  21A2 9F52 0D1F 00F9 AF98

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