-----BEGIN PGP SIGNED MESSAGE----- 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@mcs.anl.gov -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com> iQCVAwUBOlzHxqwgm7ipJDXBAQEkoAP/RbNxPa6Qcre9bKHm59dF2wLYSmFVuX7z zWZr2b/j6PyP1MpANTJ5MgVRNwhuM9rRU+UjyeMPHTBR69KqG1jvVNBS4DYhPUR0 lI5h5pv/blyfcp6CXvR1GEUacmo8AQ0pvCSkGYp4MvYNuT+7q4qY6Jbk8XO9h/fU ri/nRwr7mG4= =lE4b -----END PGP SIGNATURE-----