Cogent move without renumbering (was: Cogent/Level 3 depeering)

Fri Oct 7 17:52:24 UTC 2005

Patrick W. Gilmore wrote:
> 
> On Oct 6, 2005, at 8:32 PM, Niels Bakker wrote:
> 
>> * deepak at ai.net (Deepak Jain) [Fri 07 Oct 2005, 02:29 CEST]:
>>
>>> I think Cogent's offer of providing free transit to all single  homed 
>>> Level3 customers is particularly clever and being  underpublicized. 

Yes, and now that we know enough publically available details, it's
time as a community to assist in moving all NANOG ISPs from Level3 to
Cogent without renumbering.

>> I guess a significant part of the single-homed networks behind Level 
>> (3) would be in PA space owned by them, and thus will find the  
>> initial step towards multihoming very hard to take (renumbering  into 
>> PI or their own PA space).
> 
> 
> Renumber why?
> 
> If they have a /24, all they need is an AS & a BGP capable router.
> 
> If they don't have a /24 or larger, then they will either need to  
> renumber, or NAT, or some other fun magic.  But the upper bound on  the 
> difficult of such exercises is exactly equal to changing providers.
> 
It's unlikely that they have an AS when not already multihomed.

If everybody with a /24 got an AS, we'd run out quickly.  Bad policy.

However, we should assist everybody without an AS and at least /24 to
move to Cogent without renumbering.  That means the blocks should be
reassigned.  That requires registry assistance.

To avoid routing table explosion, we probably need to identify adjacent
blocks and encourage them to move to Cogent, too.

-- 
William Allen Simpson
     Key fingerprint =  17 40 5E 67 15 6F 31 26  DD 0D B9 9B 6A 15 2C 32