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>And nowadays big data centers are basically just SDNed, and you might as well not be using IP in the data center at all, because nobody's routing the packets.
by hueving 9y ago
>And nowadays big data centers are basically just SDNed, and you might as well not be using IP in the data center at all, because nobody's routing the packets. It's all just one big virtual bus network.
The opposite trend is true in large data centers. L3 fabrics where everything is routed have become extremely popular because BGP (or custom SDN setups) can be used to migrate IPs and you get to utilize multiple paths (rather than the single path offered by STP convergence).
- Duckeh 9y agoBut then you're tunneling your L2 across your L3. So if you provide connectivity to a customer in a datacenter all they'll see is the L2. But you're right. Underneath everything is an IP fabric these days.
- imbriaco 9y agoThis is extra delicious irony given the fact that the typical, and often only, requirement for these SDN layers is IP connectivity.
- Natales 9y agoExactly. Virtually all new DCs are being build using Leaf-Spine architectures that leverages pure IP routing and optimize for East-West traffic internally. I'm also starting to see the rapid proliferation of L3-only SDN systems like Project Calico [1] in fairly large Fortune 100 companies, for any sort of end point, particularly containers these days. [1] https://www.projectcalico.org/learn/ https://www.projectcalico.org/learn/