[c-nsp] Re: 7500 PPPoE dCEF aggregation

[Rodney Dunn]

Gert,

There is a 2048 IDB limit on the 75xx and it
will most likely never be increased.  There
are multiple reasons why this box is not
recommended for broadband aggregation.

a) Originally we didn't have dCEF support
   for VA interfaces.  This did get added
   at some point along the way I think
   as part of dLFI and not directly to
   support broadband aggregation.

b) IPC communication between the VIP and
   RSP can become a bottleneck for large
   numbers of interfaces with features
   applied.

There is also one feature that I know of
that wasn't supported when I last looked
at it and that was VLAN unnumbered support.

This platform is not tested in this deployment
scenario also.

If it were me looking for a platform to do
broadband aggregation I would not look at the
75xx for this purpose.

72xx/G1, 7301, 10k are the most commonly used
boxes for this space that I have seen.

I don't recall if there was a discussion about
the MWAM blade for the 76xx to do this functionality
or not.

My 2c. based on experience....

Rodney

On Mon, Jan 17, 2005 at 05:10:36AM +0100, Gert Doering wrote:
> Hi,
> 
> On Sun, Jan 16, 2005 at 04:29:03PM -0500, Joe Maimon wrote:
> > As it stands, both GRE and L2TP are dCEF on the 7500 platform, I dont 
> > see how PPPoE which has only a 8 byte header compared to GRE's 24 would 
> > be so much harder.
> 
> Out of curiosity: for these tunnels which VIP does the encapsulation work?
> The VIP that has the outgoing interface corresponding to the "tunnel dest"
> IP?  Or can you tie GRE/L2TP processing to a specific VIP (sort of like 
> the Juniper Tunnel PIC)?
> 
> Back on topic, I think the 7200/NPE-G1 or 7301 are very interesting boxes
> here - much less real estate, much faster primary CPU, and a fast second
> CPU that Cisco is already working on, implementing these nice things...
> 
> gert
> 
> -- 
> USENET is *not* the non-clickable part of WWW!
>                                                            //www.muc.de/~gert/
> Gert Doering - Munich, Germany                             gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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