Exchange point peering

Bill Nickless nickless at mcs.anl.gov
Wed Jan 10 20:36:22 UTC 2001



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At 03:08 PM 1/10/2001 -0500, Robbie Harrell wrote:
>Does anyone know how this works at the Chicago NAP?  Is my PCR for my ATM
>port set at line speed for DS3 OC3 and OC12.  How do they prevent random
>cell discard at the egress port to upstream providers, is there a graceful
>discard so that cells are dropped to maximize good "packets".

All of our peerings at the Chicago NAP contend for access.  Discard happens 
randomly.  That is, we assume the Chicago NAP is a UBR service.

The Chicago NAP publishes the line rate of each customer.  We set our 
router to queue cells at the appropriate rate (DS-3, OC-3, whatever) for 
that peer.  We also set our ATM switch to do ATM packet discard, of course.

In practice this has worked quite well for us.
===
Bill Nickless    http://www.mcs.anl.gov/people/nickless      +1 630 252 7390
PGP:0E 0F 16 80 C5 B1 69 52 E1 44 1A A5 0E 1B 74 F7     nickless at mcs.anl.gov

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