All things related to multicast

["David Farmer" <>]

I had cause to take a look at RFC 3171 today.

So, I have a multicast best common practice (BCP) question.

Since 225.0.0.0 - 231.255.255.255 and 234.0.0.0 - 
238.255.255.255 are reserved per section 2 and per section 11 
reserved space is not to be used by applications should any traffic 
destine to these locations be consider BOGON until assigned?

Would it be a bad idea to block it?  Particularly at an administrative 
boundary.

I don't see any discussion of reserved space in Bill Nickless' 
Internet Draft related to these issues.

http://www.ietf.org/internet-drafts/draft-nickless-ipv4-mcast-
unusable-02.txt

What do others think?  I what problems do you see in doing 
something like this?  

For sure you would have to monitor any new IANA assignments 
and update the filters to allow any new assignments.  But this 
shouldn't be anymore work that any other BOGON filters.

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