Mike, please see inline below: At 10:45 AM 7/16/2009, M Callahan opined:
We have several 3560G switches deployed as access switches in a small data center environment. With the increased use of Gig at the access layer, the notion of using EtherChannel to get increased uplink bandwidth back to a WS-X6548-GE is something we've been discussing recently too. As has been discussed, this won't work the way we'd like it to due to the over subscription design of the X6548. That said, would an EtherChannel setup between the SFP ports on the 3560G and a X6516-GBIC card in the 6509 have any similar type of limitation, or would it work to acheive the increased uplink bandwidth?
6516 is basically 16 1G ports feeding into a single 8G fabric channel, so 2:1 oversubscribed if all ports are pumping. But it's not port level oversubscription, so you could definitely use this card & it is very typically used in this manner.
You just need to engineer it such that enough uplink b/w and agg layer capacity exists to support the access layer, based on the environment. Oversubscription ratios are very application/environment specific, anywhere from 1:1 all the way to 20:1 or more, so some baselining etc might be in order.
Also, is the only difference between the WS-X6516-GBIC and the WS-X6516A-GBIC the per port buffer size?
Of the top of my head, that, and the replacement of Titan/Medusa chips with the Hyperion ASIC for multicast replication & fabric interface. Hyperion permits the use of egress replication with the A version of the card.
HTH, Tim
Thanks, Mike
Tim Stevenson, [email protected] Routing & Switching CCIE #5561 Technical Marketing Engineer, Cisco Nexus 7000 Cisco - http://www.cisco.com IP Phone: 408-526-6759 ******************************************************** The contents of this message may be *Cisco Confidential* and are intended for the specified recipients only. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
