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truetaurus
Beginner

deploying a FEX considerations

Hey

I have a few questions regarding deciding upon a FEX:

What type of architecture should be used? This would be ToR?

What are the clear benefits of it? Easier to manage?

What drawbacks are present?

Thanks

2 REPLIES 2
Reza Sharifi
Hall of Fame Expert

The Fex is usually used as TOR.  You also need a couple of 5Ks or 7Ks to connect the Fex to.

HTH

Leo Laohoo
VIP Community Legend

The concept of a remote-end-line-card, aka FEX in Cisco's marketing parlance, is a significant (if not a major) hit.  It's so successful that this concept will make a re-incarnation very, very soon.

Depending on what you're hardware is, FEX requires a "mother" controller because the FEX is, literally, a dumb switch.  The mother controller acts a single management entity.  Controllers comes in various forms, the traditional one is the Nexus 5000/5500, Nexus 6000 (if you want to play with alot of 10 Gbps and a few 40 Gbps), and Nexus 7K.

Be aware, that use the Nexus 7K (to manage 2K), as a last resort.  Why?  It's is cheaper to buy more Nexus 5K/6K vs buying more 7K as you add more 2K.

You'll also see alot of documentations about dual-homing the Nexus 2K up to two Nexus 5K.  Please avoid that temptation.  Instead, the best "well proven" practice is to dual/multiple-home your uplink to a single Nexus 5K and dual home your servers to two Nexus 2K.