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Posted by on Apr 10, 2014 in Networking | 1 comment

Scalability with NSX

Scalability with NSX

One of the first arguments I hear every time I start talking about NSX usually goes something like, “You are talking about handling networking within an x86 platform. There is no way that is going to scale the way ASIC can.” I heard this very same argument just yesterday afternoon. And at least twice last week. It is a very common misconception from someone who doesn’t understand the architecture behind NSX. Let me first say that I agree unequivocally that if you were to replace your ASIC sitting at an aggregation point on your network (top-of-rack, end-of-row agg, etc) with an x86 solution, it will tank. No argument from me there. ASIC is necessary for that function. The difference here is that the VMware DVSwitch (and in conjunction the NSX distributed logical router and firewall) is not sitting at an aggregation point, but a distribution point. This is key. If you think about it, we have been using the vSwitch since 2003. The VMware DVS or 1kv is probably pushing...

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Posted by on Apr 8, 2014 in Networking, Opinion | 0 comments

Declarative or Imperative SDN?

Declarative or Imperative SDN?

There has been some recent “Brew Ha-Ha” in the media over the Imperative vs Declarative SDN models. I think most of this is coming to the surface now because of the recent presentations and announcements at InterOp. Even I became caught up in the arguing. Specifically after a recent “Networkworld.com” article referring to Cisco’s OpFlex (and the declarative model that it operates in) as the “OpenFlow SDN killer.” Actually, before I go on, can someone please come up with a better naming convention for these protocols? OpFlex sounds like some early-90’s infomercial exercise equipment, and OpenFlow sounds like some sort of personal hygiene product. Frankly that article just really ticked me off. It appeared to me that Cisco was in essence giving the “middle-finger” to the Open Networking Foundation (ONF) and the work Cisco has been doing with OpenDaylight. The problem here seems to be the mixed-messaging coming from Cisco. Jim Duffy with NetworkWorld.com brilliantly highlights this here. On the one hand Cisco does not endorse the imperative SDN...

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