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Re: UBR at MAE-East ATM, anyone?
Ah! This is a bit different from what was previously said, but not that different. Mostly replace SCR with MCR. You can specify an absolute PCR for an ABR PVC (total traffic, both tagged and untagged (clp0+1)). This is typically done to prevent a faster input circuit from overwhelming a slower output circuit, e.g a PVC from an OC-12 source to a DS-3 destination, but I can't imagine why simply someone would specify PCR as twice MCR as opposed to capping it at the speed of the destination circuit or some other hardware enforced limit. Steve, any chance you could shed some light on this? > <snip> > > > 3) is it still VBR, or UBR/ABR now? > > It's actually implemented as ABR, with the peak cell > rate enforced and set to twice the reserved rate. > > </snip> Alex, where did this come from? I've never seen this and would love to have a reference. There is no documentation on http://www.mae.net/atm/ as far as I can see and I didn't see this in the Peermaker manual (although I could have missed it). R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: [email protected] Phone: +1 510 486-8634