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. Thanks for your input. -b -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Geoffrey Pendery Sent: Friday, June 12, 2009 6:36 AM To: Bill Blackford Cc: [email protected] Subject: Re: [c-nsp] x6148 vs. x6548 Well, with the 6548, you're still going to be limited to 8 Gbps, rather than 6 Gbps. It's a CEF256 card, which means it has an 8 Gbps fabric connection to the supervisor, instead of just sharing the 32 Gbps like the 6148 does. So if you're looking to drive more than a gig through an Etherchannel, it will do it, but only for a limited number of them. The 6748 would bump your bottleneck up to 40 Gbps. I have a question of my own, since this subject has come up a time or two - regarding the 6148's, the statement is made a couple times that Etherchannel will get you port redundancy but no extra bandwidth, since the ASIC is only a gig. But if I distribute my channel across two slots, say Gig 1/1 and Gig 2/1, does that get me around the gig limit? Or even Gig 1/1 and Gig 1/48, since it's separate ASICs? Logic tells me yes, but I've heard the "1 gig limit" mentioned as if it's a hard platform limitation, not just a result of a particular bottleneck. My instinctive behavior with channels is to span them across blades anyway, to guard against blade failure.... -Geoff On Thu, Jun 11, 2009 at 9:20 PM, Bill Blackford<[email protected]> wrote: > I've recently learned that the ws-x6148-ge-tx has 6 gig ASICs, one for every > 8 ports thusly rendering this line card to a 8:1 oversubscription ratio. I've > also learned that an etherchannel is limited to 1 gig, great for redundancy, > but slow as all get up. > > I'm buying a ws-x6548-ge-tx in hope that it can do much better (I didn't have > enough in my budget for a x6748). How does the 6548 compare to the 6148? I > have a pair of shiny new sup720-3bxl's. > > Thank you for any insight from the field as Cisco's site seems best suited > for the marketing of products. > > -b > > -- > Bill Blackford > Senior Network Engineer > Technology Systems Group > Northwest Regional ESD > > my /home away from home > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
