Most telcos use the proprietary protocol of their WAN ATM switches. Cisco's
WAN switches, BPX, MGX, and IGX, use autorouting--proprietary. However, you
can buy PNNI for them for a few bucks more. My guess is that most carriers
that sell ATM services, for the most part, sell PVC-based solutions. I
I am struck by just how few ATM networks actually use PNNI. The few that I
have found are small campus networks that have a one-level hierarchy, and
seemingly only run PNNI because they want to run LANE.
It would seem that PNNI would be extremely beneficial for the large ATM
clouds run by the te
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