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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: GSR, 7600, Juniper M?, oh my!
If only dCEF wasn't phuqed in so many versions of the IOS..... life would be wonderful. We had to turn dCEF off and just run plain old ip cef on our 7513 under 12.2.19a.... The RSP4 CPU spikes up to 80% then back down then UP and down... weird. Jason Frisvold wrote: > > -----Original Message----- > > From: Alex Rubenstein [mailto:[email protected]] > > > > On the 7500, you have RSPs and VIPs; the former performing routing > > protocol work, vty's, RIB's, etc., the latter doing actually packet > > forwarding. > > While this sounds great on paper, our experience has us shying away from > dCEF and looking for something bigger and better... dCEF pushed the RSP > processor down to about 5%, but pushed up the VIP processors to about > 90-95%... > > > VIP-Slot0>sh proc c > > CPU utilization for five seconds: 13%/12%; one minute: 14%; five > minutes: > > 15% > > I wish we could get our routers to do this... > > > Obviously, we run dCEF, which puts the VIP's in the position of > forwarding > > everything on their own, as evidenced by the CPU measurements. > > But each VIP is responsible for it's own traffic, so if a particular VIP > runs most of the traffic, it has much higher CPU usage... In our case, > we have a router loaded with VIP 4-50's and Enhanced ATM OC-3 > adapters... Originally, we had a single OC-3 running about 120-130 Megs > constant and the VIP CPU was at 90-95%.... To combat this, we had to > put in additional OC-3 cards with additional VIPs and distribute the > load... Still, high CPU is a problem .. For instance : > > CPU utilization for five seconds: 63%/63%; one minute: 63%; five > minutes: 65% > 30 second input rate 78227000 bits/sec, 17858 packets/sec > 30 second output rate 47944000 bits/sec, 12778 packets/sec > > It seems to me that we should be able to do sooo much better... *sigh* > OC-12 adapters are an option, but they are rather expensive ... > > > However, to answer your question, even a modestly configured 7507 with > > RSP4, and VIP2-50's will be substantially more capable than a > 7206-NPE300. > > Things may change on the NPE-400 or G1, but I have no direct > experience > > with that. > > The G1 processors, so far, have proven to be wonderful... We only have > experience with them running in the 7200 uBR chassis, but they've shown > a huge reduction in CPU utilization... > > > PS. Regards to stability; we have SUBSTANTIAL improvements in IOS > > stability, especially in 12.3.5a mainline. > > Heh.. *old* Cisco code scares me enough... Bleeding edge is simply > terrifying... *sigh* > > > -- Alex Rubenstein, AR97, K2AHR, [email protected], latency, Al Reuben -- > > -- Net Access Corporation, 800-NET-ME-36, http://www.nac.net -- > > Jason Frisvold > Backbone Engineering Supervisor > Penteledata
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