[c-nsp] x6148 vs. x6548

[Jeff Bacon]

> Date: Fri, 12 Jun 2009 06:51:17 -0700
> From: Bill Blackford <BBlackford at nwresd.k12.or.us>
> To: Geoffrey Pendery <geoff at pendery.net>
> Cc: "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>
> Subject: 
> Message-ID:
> 	<6069A203FD01884885C037F81DD7508016CE1890F4 at wsc-mail-
> 01.intra.nwresd.k12.or.us>
> 
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Your question is one of mine as well. I plan to from EC's across the
6548
> and a 6516-GBIC (yes copper and fiber).
> 
> So does this essentially mean that every 6 ports has its own gig ASIC?
So,
> I'd have to stagger like: 1/1, 1/7, 1/13, etc.?
> 
> Now, if what you're reporting is correct (I'm sure it is), then I'm
not
> getting much more benefit going with the 6548. I know I can only get a
> standard MTU with this line card as well. I could consider the 6148A
if I
> really wanted jumbo's, but that's not very high on my list of wants.
The
> 6748 is out of budget range at this time unfortunately.

I had 6548s. I found out about the ASIC limitation by IOS helpfully
telling me when I created the EC "do this and your bandwidth is going to
be limited". 

I read the docs more closely, after a brief bout of kicking self for
attempting to save a buck without reading all of the docs. My helpful
rep at World Data gave me a decent trade on the 6548s, had 6748s there
shortly thereafter, and that was the end of that.  

Yes you could on a 6548 and just stagger your ports and I believe that
will perform fine, assuming you otherwise stay within the card's
limitations (e.g. CEF256/8G fabric ports). 

I would give some thought to the 6816As over the 65116s. They seem to be
quite cheap refurb, and otherwise appear to be excellent cards, for
which DFC-3Bs don't cost a ton more should you care. Only downside I've
seen so far is that switchport vlan mapping applies to all 8 ports on
the fabric port/controller, but there appears to be a theme there
anyway. 

-bacon
Cisco-using dilettante