> Satish Patel > Sent: Wednesday, April 29, 2020 8:10 PM > To: Cisco Network Service Providers <[email protected]> > Subject: [c-nsp] VxLAN EVPN decision > > Folks, > > when someone should decide to go with VxLAN EVPN base clos design or > Tier 3 (core/dist/access) design? what criteria decide which design would be > best fix? > > Following criteria in my mind. > 1. North/South Vs east-west traffic > 2. BUM suppression ( Classic design doesn't help here) 3. If you hate STP (but > vPC is exception) 4. scale (STP has limitation because of large L2) 5. > complexity (Classic Tier 3 is easy to configure and manage) > > what other things people keep in mind to decide go with Tier 3 vs Clos > (VxLAN+EVPN) > I'd go with MPLS+EVPN -nowadays all data-centre gear supports MPLS in addition to IP. With regards to the 3-tier vs folded clos model (vs benes model) I guess one could evaluate them from the modularity viewpoint for example -more precisely how many classes of nodes you want to maintain, 3-tier = 3 types, Clos = 2 types, Benes = 1 type, - and how this affects your scaling. adam
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