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Re: PI vs PA Address Space
From: "Michael F. Nittmann" <nittmann () wis com>
Date: Fri, 19 May 1995 17:59:43 -0500 (CDT)

the proposal comes from a provider that cannot route around a cable cut 
for now more than 24h.


On Fri, 19 May 1995 peter () swan lanl gov wrote:

As an aside, is anyone else besides Sprint behind this /18

The hard core /18 model ("we won't accept prefixes greater than length
18") is untenable and throws out one of CIDR's features.  It does not
allow for a time period where a customer is migrating from provider A
to provider B and will have end systems living within both provider
based prefixes at any instant during the migration.  

The user community should not be forced into flash cuts, and the
providers can make the needed overlap period of time work for bounded
time frames.  

At a minimum, the model needs to be /18+E (E==entropy due to customer


Michael F. Nittmann                                             nittmann () wis com
Network Architect                                               nittmann () b3 com 
B3 Corporation, Marshfield, WI (CIX Member)               (715) 387 1700 xt. 158
US Cyber (SM), Washington DC                              (715) 573 2448
                                                          (715) 831 7922

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