03 Server Ports per FI

[ccnadiogo]

Hi Guys,

I´m about to start a UCS implementation in a customer and they asked me if it is possible to have 03 connections between FI and FEX.

Do you know about that?

All documents that I found always mention 1,2 or 4 connections, never 3.

Tks in advance, Diogo.

[mwronkow]

Hello Diogo,

On 2104 module only 1,2,4 connections are allowed.

On 2204 & 2208 any number of connections are allowed when used in combination with 62XX Fabric Interconnects.

Matthew

[ccnadiogo]

Thanks for your quick reply Matthew!

Do you know why Cisco doesn't permit 03 connections?

I'd like to have a better understand about it because I'll have to explain to my customer.

Diogo.

[mwronkow]

Hello Diogo,

In the 2104 module 3 link topology is not supported due to the way blades are pinned.  8 blades cannot be equally divided to 3 ports.   Architecture changes in the 22XX series allow links to be port-channeled which lift the number-of-links limitation.

Will the customer's implementation use 21XX or 22XX modules?

Two-link topology with the 2104 should provide sufficient bandwidth for the majority of UCS installations.  You could also choose 4 link if additional bandwith is required.

Matthew

[ccnadiogo]

Hi Matthew,

Now I understood. Customer will use 2104 but I'm trying to push 04 connections since day zero to have a more scalable solution.

Tks for the explanations!

Diogo.