[c-nsp] bgp router

[Rodney Dunn]

On Fri, Jun 06, 2008 at 08:33:13AM +0200, Elmar K. Bins wrote:
> Re Gert, re Rossella
> 
> gert at greenie.muc.de (Gert Doering) wrote:
> 
> > On Wed, Jun 04, 2008 at 09:43:54AM -0700, Rossella Mariotti-Jones wrote:
> > > This is good to know, thanks.
> > > We're going to have at least two ISPs possibly add more in the future,
> > > and a 100Mb pipe to it, which will grow to 200Mb soon. Right now we only
> > > have a DS3 and a lot of the times it gets up to 40Mb. I'm assuming we'll
> > > probably be pushing 80Mb easily pretty soon. This is our first BGP
> > > experience, we don't want to over buy but we also don't want to get
> > > stuck with a unit that's not going to be able to keep up.
> > 
> > My gut feeling is "go with a 7301 or 7200/NPE-G1".
> >
> > Why?  Because it can deliver the 200 Mbit/s bandwidth, and it's a 
> > "simple" architecture - everything is software, and there is lots less
> > hidden surprises than with the 6500/7600 platform.
> 
> That would depend on packet sizes. I know we're a bit extreme (most of
> our packets are around 64-128 Bytes), yet...we're hitting 50% CPU
> load on 7301s with like 60 Mbps of Traffic (in+out aggregated), which
> amounts to around 72kpps.
> 
> If your traffic consists of considerably larger packets, you may want
> to go with 7301s (G1) or 7201s (G2); if your packet sizes are small,
> you need to consider hardware forwarding platforms.
> 
> 
> > If you need lots of ethernet ports, trunk one of the GigE ports from the
> > router to a L2 switch (2950T-24 or such), and use that to fan out all the
> > individual ports.
> 
> Be careful if you set up an etherchannel; G1s and G2s do that in software,
> too, and it takes away forwarding capacity...
> 
> Why is it, btw, that IOS doesn't use both CPU kernels there? Or did I miss
> an IOS version that started doing that? (still on 12.3T here)

Nope. Never will.

ASR will be the way forward.

Rodney


> 
> 
> Yours,
> 	Elmi.
> 
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