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6704 & Virtual Switch Link

I have two 6509-V-E each with a Sup720/two CX4s and have established a VSS using said interfaces. I was sold two standard 6704 modules and XENPAKs to create a third link. Adding the third link does not work with the configuration attempt stating unsupported hardware. Can I upgrade the 6704 with a WS-F6700-DFC3A/ 3AXL or do I have to upgrade the module to a 6708 which includes the DFC.


Craig Henry

Network Architect


Re: 6704 & Virtual Switch Link

Hi Craig,

From this White Paper on VSS -

"Because a VSH (virtual switch header) is appended onto every frame that is sent across the VSL, there are also new port ASIC requirements to be able to form the VSL. The interfaces that can currently form the VSL are the 10 Gigabit Ethernet uplink interfaces on the Cisco Catalyst 6500 Series Supervisor Engine 720-10G VSS as well as those on the 8-port 10 Gigabit Ethernet line card (WS-X6708-10G-3C/XL)"

So upgrading the 6704 is not going to help and a 6708 line card would be required if you want to have a third VSL.

-> Sushil

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