[arin-ppml] ULA-C

David Farmer farmer at umn.edu
Thu Apr 1 15:51:53 EDT 2010

Joel Jaeggli wrote:
> On 04/01/2010 12:05 PM, Michael Richardson wrote:
>>>>>>> "Alain" == Alain Durand <Durand> writes:
>>     Alain> The IPv4 parallel to draw is not with RFC1918 (it is
>>     Alain> meaningless to advertize net10 because it is not unique), but
>>     Alain> with long prefixes in IPv4.  How many /24s in your routingb
>>     Alain> table? Or longer?
>> So what?
>> Show me the IETF or ARIN or RIPE or ... policy that says that they
>> shouldn't be announced? 
> More to the point there are direct analogies betwen the class-c swamp
> and the concerns expressed about the potential for unique assignments to
> be advertised at some point in the future. fwiw we do advertise our
> swamp space in an aggregated fashion because it's possible to do...
> The swamp almost broke the internet the last time around...

Is this an issue of ULA-C or PI, I see more of an analogy between the 
swamp and PI, and lest in the fact of lots of unaggregatable routes. 
For a majority of the ISPs ULA or ULA-C can be filtered with a single 
policy statement and have a covering aggregate point at null.

One of the reasons that I believe the RIRs need to be involved in and 
control the policy under which ULA-C is given out is to impose good 
stewardship on the ULA-C resources.  This should help avoid the other 
problem of the swamp, lots of stale or even rotted POC and assignment 

If you are going to have a registry it needs to be properly maintained, 
that cost at least some money and if you doing want to pay for that then 
use ULA-L.  And, this is not just a one-time payment, it costs money to 
maintain the registry over time too.

Further, the costs of maintaining a registry for PI or ULA-C are 
probably not going to be significantly different, you are doing most of 
the same things.

David Farmer               Email:farmer at umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota	
2218 University Ave SE	    Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952

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