[c-nsp] Nexus 7000

[Tim Stevenson]

At 03:04 AM 1/29/2008 -0600, mack observed:
>Ok that math doesn't make sense.
>60/48=1 1/3 not 2.

So at small packets, this system can do 4 ports non blocking & 6704 can do ~3.

>Even at that 32 ports with 80gbps forwarding is still an 
>oversubscription of 4:1

Yes, this card is 4:1 oversubscribed at the port level - ie 4 ports 
share 10G b/w toward the rest of the system, you will never get more 
than 10G from each 4-port group.


>Of course real world will probably allow forwarding of more than 
>80gbps at 60mpps.

You will not get more than 80G out of this card.


>The performance listed jives pretty well with the 230gbps / slot 
>(figure 500 byte packets).

The 230G is a characteristic of the intially shipping FABRIC - the 
initially shipping IO modules don't leverage the full fabric b/w.

>Meaning a 1.4:1 oversubscription on the 32 x 10GE card (assuming 
>single direction traffic).

No, you will not get a 1.4:1 ratio on this card.

Tim


>--
>LR Mack McBride
>Network Administrator
>Alpha Red, Inc.
>
>
> > -----Original Message-----
> > From: Tim Stevenson [mailto:tstevens at cisco.com]
> > Sent: Tuesday, January 29, 2008 2:52 AM
> > To: mack; Tom Storey; Pete Templin
> > Cc: cisco-nsp at puck.nether.net
> > Subject: RE: [c-nsp] Nexus 7000
> >
> > At 02:38 AM 1/29/2008 -0600, mack observed:
> > >The 60mpps (30mpps) forwarding rate per slot is pretty anemic
> > >considering a 6704-10GE w/ DFC will do 48mpps per slot.
> >
> > True. But, after the pps is removed as the bottleneck, this system
> > will do 8 10G ports at line rate per slot vs ~4.
> >
> > Tim
> >
> > >This is obviously for heavy duty back end applications and not
> > >satisfactory for front end delivery to the internet.
> > >The 6500/7600 is still the obvious sweet spot for data centers
> > >specializing in content delivery to the internet.
> > >
> > >The CRS-1 is really cool but cost way too much.
> > >The 8 slot system even has a lower total bandwidth capability than the
> > 7609.
> > >It doesn't shine until you go to the 16 slot system.
> > >
> > >--
> > >LR Mack McBride
> > >Network Administrator
> > >Alpha Red, Inc.
> > >
> > > > -----Original Message-----
> > > > From: Tim Stevenson [mailto:tstevens at cisco.com]
> > > > Sent: Tuesday, January 29, 2008 1:51 AM
> > > > To: Tom Storey; Pete Templin
> > > > Cc: mack; cisco-nsp at puck.nether.net
> > > > Subject: Re: [c-nsp] Nexus 7000
> > > >
> > >[snip]
> > > >
> > > > 60Mpps IPv4 unicast per slot, 30Mpps IPv6 unicast per slot. Routing
> > > > protocol highlights: OSPFv2/3, ISIS, BGP, EIGRP (v4).
> > > >
> > > > Also doing v4 & v6 multicast, SM, SSM, bidir, with abundant
> > multicast
> > > > replication bandwidth.
> > > >
> > > > Tim
> > > >
> > > >
> > > > >Hopefully more docos are on the way which will detail all of this.
> > > > >
> > > > >_______________________________________________
> > > > >cisco-nsp mailing list  cisco-nsp at puck.nether.net
> > > > >https://puck.nether.net/mailman/listinfo/cisco-nsp
> > > > >archive at http://puck.nether.net/pipermail/cisco-nsp/
> > > >
> > > >
> > > >
> > > > Tim Stevenson, tstevens at cisco.com
> > > > Routing & Switching CCIE #5561
> > > > Technical Marketing Engineer, Data Center BU
> > > > Cisco Systems, http://www.cisco.com
> > > > IP Phone: 408-526-6759
> > > > ********************************************************
> > > > The contents of this message may be *Cisco Confidential*
> > > > and are intended for the specified recipients only.
> >
> >
> >
> > Tim Stevenson, tstevens at cisco.com
> > Routing & Switching CCIE #5561
> > Technical Marketing Engineer, Data Center BU
> > Cisco Systems, http://www.cisco.com
> > IP Phone: 408-526-6759
> > ********************************************************
> > The contents of this message may be *Cisco Confidential*
> > and are intended for the specified recipients only.



Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Data Center BU
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
********************************************************
The contents of this message may be *Cisco Confidential*
and are intended for the specified recipients only.