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Why all the fuss with layer 2 overlays?

NVGRE, VXLAN, STT, L2TP, VPLS, OTV, CAPWAP
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Tyrone
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Why all the fuss with layer 2 overlays?

Postby Tyrone » Wed Nov 12, 2014 12:17 am

I understand what these overlays accomplish, but why are they all in our face lately? Our existing solutions aren't cutting the mustard anymore?

Ty

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Tbird
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Re: Why all the fuss with layer 2 overlays?

Postby Tbird » Thu Nov 13, 2014 12:28 am

Good question Ty. Correct, our existing layer 2 segmentation techniques are not scalable enough support the virtual machines in many cloud environments today. More specifically, the number of MAC entries and VLAN instances are growing at too rapid of a pace to keep up with multi-tenant VM and elastic cloud workloads. One example is our current STP model that lacks ECMP support and is limited at 4094 VLANs. Another example is our limited MAC table size on edge switches. While each of the layer 2 overlay techniques have their own strengths and weaknesses, they attempt overcome the constraints of STP by enabling layer 3 transport through layer 2 overlays - in some cases increasing the segmentation within the layer 2 domain.

Tom

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