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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Anyone encountered Cisco ATM PVC large delay bug?
Hi, ----- Original Message ----- From: Alex Rubenstein <[email protected]> To: Yu Ning <[email protected]> Cc: nanog-post <[email protected]> Sent: Friday, April 21, 2000 8:01 AM Subject: Re: Anyone encountered Cisco ATM PVC large delay bug? > > > > Are you accounting for ATM overhead? Remember, the sho in bits/sec do NOT > count overhead (another words, they are looking at true bits/sec, not > cells/sec). > > You should check cells/sec on the ATM port you are connected to. > Yes. I get the utilization statistic from ATM PVC statistic. > > > > > In more detail, our situation is: if we get a high bandwidth PVC, > > say 51M(or 80M), and if the bandwidth utilization reaches 80% > > percent, the ATM link will encounter a 1500~2000 ms delay - just > > point to point ping across the link. We have found this situation > > is associated with "sar txpool" setting in Cisco GSR, and a manipulation > > of the "sar txpool" together with bandwidth increasing has solved > > the problem now. > > > > But I still wonder if any of you ever encounter this situation(bug), > > and how did you overcome it? If you are still puzzled by this bug, > > I'd like share our temp solution with you. > > > > > > regards, > > > > Yu Ning > > > > ------------------------------------------- > > (Mr.) Yu Ning > > ChinaNet Backbone Operation > > Networking Dep.,Datacom Bureau > > China Telecom.,Beijing(100088),P.R.C > > +86-10-66418121/66418122/66418123(fax) > > ------------------------------------------- > > > >
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