Hi Peter, Do the overrun match with input drops on the interfaces input queue? Maybe this traffic being punted to CPU?
I had this issue on a Cisco 7600 when using "mpls ldp explicit-null" and many Gbps of traffic needed to be sent to CPU. Hope this helps. Cheers, JF Jean-François Dubé Technicien, Opérations Réseau IP Ingénierie Exploitation des Réseaux Vidéotron "cisco-nsp" <[email protected]> a écrit sur 2017-03-03 12:04:28 : > De : "Peter Kranz" <[email protected]> > A : <[email protected]>, > Date : 2017-03-03 12:09 > Objet : [c-nsp] 4x10G Etherchannel overruns > Envoyé par : "cisco-nsp" <[email protected]> > > On a WS-X6908-10G DCEF2T line card with SUP2T's, I ran into overruns > yesterday on a 4x10G etherchannel that I am at a loss to resolve: > > > > Constantly increasing overrun counter: > > 6418130558941 packets input, 9277559958229871 bytes, 0 no buffer > > Received 668274 broadcasts (0 IP multicasts) > > 0 runts, 190 giants, 0 throttles > > 192 input errors, 1 CRC, 0 frame, 51591389 overrun, 0 ignored > > > > Latency into the router rose by 40ms when these overrun's started to appear > > > > This happened at a BW of ~28 Gbps > > > > I've built the etherchannel in this manner: > > > > Index Load Port EC state No of bits > > ------+------+------------+------------------+----------- > > 0 0A Te1/1 Active 2 > > 3 81 Te1/2 Active 2 > > 1 60 Te1/3 Active 2 > > 2 14 Te1/4 Active 2 > > > > Is it necessary to instead stagger 1/1, 1/3, 1/5, 1/7 to spread the load > across the card ASICs? I didn't think the WS-X6908 was an oversubscribed > card so didn't bother initially. > > > > Peter Kranz > www.UnwiredLtd.com <http://www.unwiredltd.com/> > Desk: 510-868-1614 x100 > Mobile: 510-207-0000 > [email protected] <mailto:[email protected]> > > > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
