--- On Mon, 10/1/12, Tim Densmore <[email protected]> wrote:
> From: Tim Densmore <[email protected]> > Subject: Re: [c-nsp] asymmetrical performance inside core > To: "Cisco NSP" <[email protected]> > Date: Monday, October 1, 2012, 4:30 PM > Stab in the dark, but have you > verified you don't have a duplex mismatch > anywhere? IME, they can look exactly like that. > > > On 10/1/2012 5:03 PM, Eric A Louie wrote: > > I'm inheriting a problem that I could use some ideas to > troubleshoot. > > > > Speedtesting from within my core to other locations > within the core give me > > "asymmetrical" performance. I've traced the routes and > the path is the same > > download and upload, but I'll get very good download > speeds (30Mbps) and > > terrible upload speeds (3Mbps, 6Mbps) > > > > I've looked at MTU and it doesn't appear that there's a > lot of packet > > fragmentation/reassembly > > > > I've looked at total bandwidth utilization during the > test times across the > > backhaul and I'm not saturating the bandwidth in either > direction > > > > I've looked at the interfaces through which the packets > are traveling, and there > > are no CRC errors, no drops, no retransmissions > > > > The physical layer radio transmissions seem to be good > both directions with the > > performance testing at that level. > > > > What do I look at next? It's a problem because > customers are speedtesting and > > seeing this DSL-like performance and making noises. > > > > Much appreciated, > > Eric Louie ..as was mentioned before: a wireshark packet capture of said sucky-upload would be the place to start. another stab in the dark: Besides everyting that has already been mentioned(L2) any possibility of Funky-ECMP with IGP? ..and radio links as well....hard to troulbeshoot! ./Randy _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
