Remember that the LS1010s do not shape the traffic and try to confirm that the other end is not the cause of the cell loss. -----Original Message----- From: Martin, Christian Sent: Friday, January 15, 1999 8:03 PM To: 'nanog@merit.edu' Subject: ATM Switch Interoperability All, Does anyone have an experience dealing with cell loss between LS1010s and Cascade/Ascend CBX 500s using VBRnrt? It appears that either the LS1010 or the CBX is performing UPC operations differently, as we are seeing between .1 and 2% packet loss at the AAL, and .1 to .5% at the cell level. By allowing flexibility in the policing, or by removing policing completely on the Cascade boxes, cell loss disappears. It appears that the LS may be sending cells too close together, but we are unsure and cannot truly test thi without an Analyzer, of which no one here has any experience using (even if we had one!). The parameters are as follows: 7513 w/AIP PCR 30000 SCR 15000 mbs 3 (*32) = 96 AAL5SNAP LS1010 CDVT 600 mbs 100 cell times PCR 30000 CLP0+1 SCR 15000 CLP0 Cascade (As far as I know) mbs 100 PCR 70754 cells/sec SCR 35377 cells/sec CDVT 600 I apologize for the vendor references, and I hope some don't view this as off-topic! Regards, Chris