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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!
> -----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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