Now, you don’t have to worry about configuring the gory details of what is essentially VN-TAG because this is all handled with a few simple commands to get your FEX up and running however, this is just here do you know how FEX works to communicate with the parent switch underneath the sheets. Thus, moving forward, we’re going to refer to a FEX which parents to a Cisco Nexus switch as a ToR-FEX.Ĭisco Nexus FEX works thanks to the Cisco pioneered 802.1BR, click here for more information. This is also not meant to bring any additional ambiguity, but it is true you can use certain Cisco Nexus 22XX ToR-FEX and “parent” them to a Cisco UCS Fabric Interconnect however, I would not classify this as Blade-FEX or ToR-FEX, I’d like to coin it with the term “Fabric-FEX”, you owe me $1.00 every time you use this, send it via paypal :). I am going to outline what ToR (Top of Rack) FEX in this blog post, not Blade-FEX, to help bring some clarity around this still confusing terminology. I realize there is still some confusion regarding Cisco Nexus FEX as it relates to ToR connected FEX, which is a Cisco Nexus 2K FEX with a Cisco Nexus 5K/7K/9K as a parent switch, and the FEX you find in UCS, which we can refer to as “Blade-FEX”.
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