Re: New draft on embedding the RP address in IPv6 multicast address

["Marshall Eubanks" <tme@multicasttech.com>]

[ post by non-subscriber.  with the massive amount of spam, it is easy to
  miss and therefore delete mis-posts.  so fix subscription addresses! ]

On Thu, 10 Oct 2002 14:21:44 +0300 (EEST)
 Pekka Savola <pekkas@netcore.fi> wrote:
> Hello,
> 

Dear Pekka;

   A quick question about Section 4 :

  o "plen" MUST NOT be 0 (ie. not SSM)

     o "plen" MUST NOT be greater than 96

   The address of the RP can be obtained from a multicast address by
   taking the following steps:

      1. take the last 96 bits of the multicast address

      2. zero the last 128-"plen" bits, and

      3. replace the last 4 bits with the contents of "RPad".


If "plen" is = 1 (say), which seems to be allowed, then how do
I zero the last 127 bits of a 96 bit slice of a multicast address ?

I am pretty sure this is not what you mean, but this is what I read it to say.

Regards
Marshall Eubanks


> Me and Brian Haberman have submitted a new draft to
> internet-drafts@ietf.org. In the interim, it's available at:
> 
> http://www.netcore.fi/pekkas/ietf/draft-savola-mboned-mcast-rpaddr-00.txt
> 
>          "Embedding the Address of RP in IPv6 Multicast Address"
> 
> Abstract                                               
> 
>    As has been noticed, there is exists a huge deployment problem with
>    global, interdomain IPv6 multicast: PIM RPs have no way of         
>    communicating the information about multicast sources to other
>    multicast domains, as there is no MSDP, and the whole interdomain Any
>    Source Multicast model is rendered unusable; SSM avoids these        
>    problems.  This memo outlines a way to embed the address of the RP in
>    the multicast address, solving the interdomain multicast problem. The
>    problem is three-fold: specify an address format, adjust the         
>    operational procedures and configuration if necessary, and modify
>    receiver-side PIM implementations.  In consequence, there would be no
>    need for interdomain MSDP.             
> 
> It's 9 pages.
> 
> Comments are welcome, either directly or to the list(s) if appropriate.
> 
> -- 
> Pekka Savola                 "Tell me of difficulties surmounted,
> Netcore Oy                   not those you stumble over and fall"
> Systems. Networks. Security.  -- Robert Jordan: A Crown of Swords
> 
> 
> 
> 
> 
>