On Wed, Feb 11, 2009 at 04:26:07PM +0200, Tassos Chatzithomaoglou wrote: > We had a similar case with microbursts and lots of small packets and > after moving to NPE-G2, we're very happy with it. > Traffic goes up, CPU is blocked at 75%, still no sign of drops.
Good to know. It all depends on the load. The direction forward is hw based forwarding for gige line rate traffic (ASR1000, 76xx, etc..) > > Regarding the pause frames, i'm too very confused about them being > supported. > http://markmail.org/message/y7bjuudmbrfofp6z I've done some research and there appears to be some issues on how the MAC chip can account for the pause frames sent/received although it does appear to support flow control. But my *opinion* on that is flow control is a wasted effort becaus you can't quantify the burst and therefore you just buffer on the other side and risk drops there. Rodney > > -- > Tassos > > Lars Lystrup Christensen wrote on 11/02/2009 15:47: > >Hi John > > > >We had the same issue a few years ago on a Cisco 7204VXR with the > >NPE-G1 processor. I believe we were told, that we had hit the max > >capacity of the router. > > > >______________________________________ > > > >Med venlig hilsen / Kind regards > > > >Lars Lystrup Christensen > >Director of Engineering, CCIE(tm) #20292 > > > >Danske Telecom A/S > >Sundkrogsgade 13, 4 > >2100 K?benhavn ? > > > >-----Original Message----- > >From: [email protected] > >[mailto:[email protected]] On Behalf Of john douglas > >Sent: 11. februar 2009 14:36 > >To: [email protected] > >Subject: [c-nsp] 7301 NPE-G1 gigabit overruns > > > >Hi All, > > > >I am hoping someone may have some guidance. > > > >We have some 7301 NPE-G1 running 12.2(33)SRC3 connected to Catalyst > >3560 switch, dot1q trunking with a few Vlans. I find on the 7301 > >router whenever I try to drive a given gigabit sub interface beyond > >about 200mbps I begin to see Input Errors (Overruns) incrementing on > >the physical interface and begin exhibiting packet loss. Under the > >show controller information I see rx_overrun and rx_int_drop > >incrementing - all other Rx error values under "Statistics" section > >are zero. On the switch I see pause input incrementing, but no > >errors. > >Cpu is 40%. > > > >I have read other postings about this being attributed to microburst > >of traffic but I am still a little unclear I am trying to work out > > > >1) Does the G1 correctly support pause frames? > > > >2) Are there any knobs we can tweak - or we simply hitting the limits > >of the silicon? > > > >The short term solution has been to spread the vlan sub interfaces > >over the 3 gig interfaces however this leaves me in a situation where > >I cannot really use EEM to migrate sub interface config from one > >gigabit interface to another should there be a failure, as the target > >interface will being exhibiting overruns and loss. > > > >Any advice appreciated, > > > >Kind regards, > > > >John > >_______________________________________________ > >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/ > > > _______________________________________________ > 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/
