IP renumbering timeframe

Marshall Eubanks tme at multicasttech.com
Fri May 31 22:09:03 UTC 2002


This is described in rfc2373 and rfc2374. The 128 bit address space
is separated into a /64 for each "site" and the remaining 64 bits for 
the MAC address, etc, for interfaces on the site. The "public" topology 
is 48 bits, and this is what is supposed to be routable.

This would work with a 32 bit ASN based automatic assignment - one /16 
could be allocated to this, with 32 bits for the ASN, 16 bits for "site" 
assignments and 64 bits for interface assignments.

This is _not_ the service model of RFC2374, which envisions 8192 top 
level routing aggregators (TLA's), with other entities getting their 
address blocks from one of the TLA blocks.

Regards
Marshall

Tony Hain wrote:

> Andy Walden wrote:
> 
>>On Fri, 31 May 2002, Tony Hain wrote:
>>
>>
>>>What is the point of an ASN if all you are multi-homing is a single
>>>subnet?
>>>
>>Tony,
>>
>>I'm missing the correlation between the amount of address
>>space announced
>>and multihoming. (Beyond the prefix being too long and potentially
>>filtered). Care to elaborate?
>>
>>
>>andy
>>
> 
> The only reason for an ASN is the need to globally announce routing
> policy due to multihoming. Unless policy changes, this community tends
> to insist that the prefix length announced via that ASN corresponds to a
> site, not a single subnet. For IPv6 that means a /48 makes sense as an
> initial allocation with a new ASN, and a /64 does not.
> 
> Tony
> 
> 
> 
> 


-- 
                                  Regards
                                  Marshall Eubanks

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