Archives for posts with tag: Nexus 5000

A question that I still get quite a lot is how to connect Nexus 2000 Fabric Extenders to their parent switches – is it better to single attach them to the parent, or to dual-home the FEX to both parent switches (using vPC)? Of course there is no right answer for every situation – it depends on the individual environment and sometimes personal preference, but here are a few of my thoughts on this. Read the rest of this entry »

NX-OS release 5.2(1)N1(2) added support for storm control on Nexus 2000 NIFs / FEX Fabric Interfaces (this is also available on 6.0(2)N2(1) for the Nexus 6000) – these are the interfaces used to connect the parent Nexus 5500 or 6000 to the Fabric Extender. I looked into this feature recently for a customer so thought a quick overview might be useful as there are a couple of things to be aware of.

Firstly, the storm control percentage value that you configure gets implemented as a percentage of the total speed of the port-channel between 5K / 6K and FEX. Here’s an example:

NIF-SC-1

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The lack of support for running layer 3 routing protocols over vPC on the Nexus 7000 is well documented – less well known however is that the Nexus 5500 platform operates in a slightly different way which does actually allow layer 3 routing over vPC for unicast traffic. Some recent testing and subsequent discussions with one of my colleagues on this topic reminded me that there is still (somewhat understandably) a degree of confusion around this.

Let’s start with a reminder of what doesn’t work on the Nexus 7000:

L3-over-vPC-5Kvs7K1

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