We've selected the 6708 for our 10Gig installs. DFCs and good sized buffers. Lots of availability on the used market. Can be run in line-rate or over-subscribed mode, which might suit your deployment.
I have hopes for SFP+ linecards to drive 10Gig costs down, but I don't think much is going to happen until 40Gig/100Gig is the new backbone. Tim:> On Mon, Oct 5, 2009 at 4:47 PM, Jeff Bacon <[email protected]> wrote: >> Don't forget they are absurdly under-buffered (16MB per card, compared >> to 256MB for 6708), and you can easily cause head of line blocking > with >> certain traffic profiles. If you want to run anywhere close to line > rate >> on them you need to monitor for drops or overruns and be prepared to >> play the port shuffle game to find an arrangement that works. Passing > a >> lot of traffic within the same fabric channel (from port 1<->2, or >> 3<->4) is the biggest sin, it will start dropping at 7 Gbps. > > Well that's wonderfully comforting. Though I really probably only need > two ports anyway - ring-in and ring-out. Maybe not so bad. I'd consider > a 720-VS-10G head if I had some confidence that those two ports on the > sup were actually connected to the fabric. > > I don't really need to run line rate - this is more about latency and > burst capacity than sustained throughput. I have loads that burst from 0 > to 500Mb/sec (then back) in nothing flat, and multiple of those may run > through the wire at the same time. Or not. > > Someone pointed out that the X2 and SFP+ xcvrs don't have much punch, > and I'm going to be shooting 20-30km through passive MUXes. So that > might matter. > > (This is a bit of a roll-yer-own local metro NYC ring, which I'm doing > because I can get the wave for not much more than I'd pay for the > switched gig.) > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > -- Tim:> Sent from New York, NY, United States _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
