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Re: More route-table bloat vs. ARIN micro-allocations

  • From: I Am Not An Isp
  • Date: Sat Feb 19 03:29:38 2000


At 11:58 PM 2/18/00 -0800, Steve Rubin wrote:
>
>On Sat, Feb 19, 2000 at 12:37:32AM -0700, John M. Brown wrote:
>>
>> so I decided to poke around some more...
>>
>> I really can't see how the argument of ""Route / AS-Path" table bloat
>> is going to break things if ARIN starts doing mico-allocations for
>> providers that need to multi-home, but don't need tons of space.
>>
>> I really like the /30's, /32's...
>
>[routes deleted]
>
>I take it you get transit from the network formerly known as iMCI as from what
>I can tell, it looks like they don't send these routes to peers. I'd be
>willing to bet this is a knob they can turn off for you if you don't want to
>see the routes... Or you can just install some sanity filtering on your
>inbound peers/transit providers to nuke the /25 and up's.

I have to agree with Steve on the prefixes longer than /24. C&W is probably just leaking internal routes to customers, which you can probably filter without any loss of connectivity. (There is a nice sanity filter on the merit.edu site. :)

But John has a point about the /24s in 63.0.0.0/8 (and /20s and ....). You might as well add the entirety of AS7046 as well. (I told Jeff & Vijay and others about this over a *year* ago, but UU still announces hundreds of completely useless routes - which are not even aggregated amongst themselves.) There are more examples, I am sure everyone knows some.

Essentially, you are right John, the table is full of litter and chaff.

Besides, if all we do is give multi-homed providers "micro allocations", say in the range of /22s or so, we will not even grow the table - those routes already exist in the table under the provider's AS. In fact, we might reduce the table because some of these providers have multiple /24s which cannot be aggregated.


>Then again, like Patrick, I have no enable, so what do I know? :-)

Ohhh, good point. I do not have enable, so I cannot be correct. :)


>Steve Rubin * ser@tch.org * http://www.tch.org/~ser/

TTFN,
patrick

--
I Am Not An Isp - www.ianai.net
ISPF, The Forum for ISPs by ISPs, <http://www.ispf.com>
"Think of it as evolution in action." - Niven & Pournelle
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