[c-nsp] OC12 in a 7500

[Oliver Boehmer (oboehmer)]

> I'm too up to speed on the 12000 GSR stuff, I'm used to the 7500 with
> the RSP controling the router, and vip's being mini routers for dCEF.
> What exatcly does the CSC, FSC, and GRP do? I'm thinking the GRP runs
> the IOS for routing protocols and interface configuration. I'm not
> quite sure what the CSC, and FSCs do.

Well, the overall architecure is distributed, just as the 7500 w/ dCEF,
so the GRP runs the control plane (mgmt, routing protocols) and
distributes the FIB to the linecards, they do the forwarding. The GRP is
not involved in forwarding (unlike the RSP which can also switch
packets). Linecard forwarding is generally done in hardware using
different hardware forwarding architectures (while the VIPs in a c7500
always use the VIP CPU to software-switch traffic).
CSC and SFC make up the crossbar switching matrix used by the linecards
to switch traffic from one slot to another. CSC+SFC come in different
speeds (2.5, 10 & 40 Gbps per slot). 

	oli


> 
> -----Original Message-----
> From: Alex Rubenstein [mailto:alex at nac.net]
> Sent: Tuesday, February 08, 2005 6:17 PM
> To: Kevin
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] OC12 in a 7500
> 
> 
> You won't see anywhere near 622 mb/s on the 7507, unless it has only
> two routes in the FIB, no features, and all 1500 or 4470 MTU packets.
> 
> Real world, expect about 300 mb/s, at best, across a OC12. And, yes,
> the SRP card will talk to a telco OC12, but there needs to be a box
> (or boxes) speaking SRP on the other end.
> 
> I can't recall if there is a straight OC12 POS card for the 7500, but
> I am guessing not.
> 
> You can get a cheap-ass GSR on ebay or network-resell with a GE and
> OC12 that should do the trick for only a few thousand. 12008's are
> cheap these days.
> 
> I've personally had very good luck with OC12 OSM cards on the
> 6500/7600, which are capable of line rate without question.
> 
> 
> 
> 
> 
> On Tue, 8 Feb 2005, Kevin wrote:
> 
>> We currently have a couple of 7500s.
>> We are looking at adding more bandwith to a new backbone provider
>> via an OC12. My question is can the 7500s handle an OC12, It looks
>> like there is an oc12 PA for the 7500, a (PA-SRP-OC12)
>> What kind of line-rate performace can I expect from this interface
>> in a VIP4-50 or 80? Can I even use this to interface to a telco OC12
>> circuit? 
>> 
>> If a 7500 can't handle an oc12, it looks like a 7300 can, has anyone
>> seen any performance numbers for these little units with an OC12?
>> 
>> 
>> Kevin
>> Honeycomb Internet Services
>> 
>> 
>> 
>> 
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> 
> -- Alex Rubenstein, AR97, K2AHR, alex at nac.net, latency, Al Reuben --
> --    Net Access Corporation, 800-NET-ME-36, http://www.nac.net   --
> 
> 
> 
> 
> 
> 
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