you can load up to 600 mbit/s per PCI bus, the VXR has 2 PCI buses.
a DS3 is going to grab 90 mbit/s [max]. so even if you put all 5 on
the same PCI bus, 5 * 90 = 450 mbit/s, the PCI bus won't be overloaded.
however it would be recommended you split the PAs between the 2 buses.
the 1.2 gbit limit is a conservative limit that we are willing to support.
the theoretical limit is much higher, but we only want to support what we
feel is a practical throughput.
that said, the NPE-300 switches 300 kpps under lab conditions
using POS interfaces. so your mileage may vary.
i would think if you are using say a IMix packet size of about 276 bytes,
you will need
450 / (276 * 8) = 203804 pps
if you are running all 5 DS3s full bore in both directions.
i would recommend discussing this issue with your local account team. they
may be able to go thru' this stuff with you and figure out if the NPE-300
will work for you, or if other products/NPEs in the 7200 family roadmap
might work for you.
cheers
.siva
>
>
> I have never tried to route 5DS3s (sustained traffic) over a router as
> small as a 7206VXR. And with a 1Gbp/s bus I am concerned I may get awfully
> close to smashing it.
>
> I am trying to conserve rack space, not IP space. :)
>
> Thanks for the suggestion.
>
> Deepak Jain
> AiNET
>
> On Mon, 18 Sep 2000, Siva Valliappan wrote:
>
> > is there a reason you can't use a VXR/NPE-300 with CEF per-packet load
> > balancing [instead of the imux path]? if all you need is to conserve
> > ip address space, you can un-number the DS3s to a loopback interface.
> >
> > cheers
> > .siva
> >
> > >
> > >
> > > I need to provision about 250mb/s of clearchannel IP capacity between two
> > > POPs. I'd prefer to do this over OC12POS, but WCOM is 6 months behind
> > > capacity for us right now, and can't provide us any additional optical
> > > services into that building.
> > >
> > > So I am stuck using DS3s with the ILEC. I'd rather not stick 2 6port DS3
> > > cards (1 in each router) to get the job done while we are waiting for WCOM
> > > capacity. Are there any good DS3-IMUX solutions to either 100Mbit/s or
> > > 1000Mbit/s ethernet? Or can anyone recommend a good (emphasis on small
> > > rack space requirements) Cisco box that can handle that?
> > >
> > > If I have to terminate the DS3s in a router, I was thinking (from a rack
> > > space point-of-view) either an M20 or a 7206VXR. The Juniper seems like
> > > overkill because there are no complex routing needs and even a 4-5xDS3
> > > bridge would be more than sufficient.
> > >
> > > Any ideas would be most appreciated.
> > >
> > > Deepak Jain
> > > AiNET
> > >
> >
> >
>
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:17 EDT