- Bronze, 100 points or more
I'm looking around at various line modules for the 6500 series with Sup 720...
I was reading that the WS-X6748-GE-TX w/ WS-F6700-DFC3 could access 720gb of backplane... does that mean all 48 ports could run at full GB speeds? I don't seem to see anything listed about over subscription. General idea is that i want to replace my pair for 4507R backbone with a 6509-E VSS setup and i'm exploring the various switch fabric cards I could use.
This is what I was thinking about:
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Cisco 6506-E w/ redundant VS-S720-10G-3C
Dual Power supplies 1400w AC
2x WS-X6748-GE-TX w/ WS-F6700-DFC3
These would be for my backbone, no PoE required. Provides server access and access-switch aggregation (collapsed core design). Servers are mostly ESX hosts. Will be some iSCSI traffic, so I would like Jumbo Frames, which the WS-6748 supports.
Thanks for the information. If the card connects at 40gbps, whats the advantage of having the Sup720 with the DFSC3 card? Where does the 720gbs backplane come in handy? I'm just trying to learn about the platform a bit more and how what advantages this would gain me. Thanks!
720Gbps is the total switch fabric capacity - it's worked out this way
In a 6509 all 9 slots can support 40Gbps connectioin to switch fabric.
So 9 x 40Gbps = 360Gbps
However because the switch fabric is full duplex connectivity Cisco double up the figures so
360 x 2 = 720Gbps
So each WS-X6748-GE-TX module has 40Gbps ( 2 x 20Gbps ) connectivity to the switch fabric.
The WS-X6724-SFP has a single 20Gbps connection to the switch fabric so again there is some oversubscription.
Note that these are physical limitations per slot ie. the 6724-SFP only uses 20Gbps of the switch fabric but that does not mean the other 20Gbps is available to other modules.