[c-nsp] 7500 for DSL aggregation - RSP memory error?

[Gert Doering]

Hi,

On Tue, Aug 04, 2009 at 10:56:56AM -0700, Walter Keen wrote:
> Yes, I believe it was you.  We are trying to migrate from a 7200 to a 
> 7500 to gain route processor redundancy.  

"Don't".

The 7200 is a much better maintained platform, and the 7500 will give
you headaches just *because* you have redundant processors, distributed
things and too-complex packet paths in it.

> Our traffic is typically 
> 20mbit peak from this site between 2 atm ds3's.  Using radius, pppoa, 
> and some dsl subs are behind NAT, but we're slowly weeding them out into 
> having a typical dsl connection with a public ip.  Probably about 1k 
> subscribers, and in the next year or two we'll probably be moving them 
> to an ethernet-based handoff from the carriers to us.

All this stuff is something that happens to be in the 7500 code base, but
Cisco didn't really test it on that platform, and won't fix any bugs that
you find - and there are lots :-(

I'd really really go for a 7200 - and for redundancy, put a second 7200
on top of it.  Yes, in theory this is much less fail-save, but in practice,
7200s just don't die... - in the last 10 years, we had a single NPE die
on us (from a pool of about 12 7200s, NPE-150 to NPE-G1), but *much* more 
fun with CyBUS stall/resets and such on our single 7500.

If you *insist* on having route-processor redundancy (what about interface
and physical path redundancy?), I think you can do that with ASR1k, but
I admit to not having any hands-on experience with that platform yet.

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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