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avoid spanning tree like the plague in large datacenter networks as well. because of the scale and it becomes an impossible black box. there is a reason evpn e
by kazen44 5y ago
avoid spanning tree like the plague in large datacenter networks as well. because of the scale and it becomes an impossible black box.
there is a reason evpn exists, and is it to solve this exact issue by making gateways handle all logic normally stretched across to the other side of a l2vpn.
- ArchOversight 5y agoI am a firm believer in layer 3 everywhere. No more layer 2 connectivity as much as possible. It's how I deployed VM's at scale using BGP from the VM host to the top of rack switch. VM's could route to each other, but no layer 2 connectivity. It allowed for easy migration of systems between VM hosts too, as the ToR would learn the /128 or /32 and traffic would route to the new VM host.
- p_l 5y agoExactly - your L2 Ethernet shouldn't go beyond immediate connection between end system and first L3 router, in DC conditions it should be to Tor... Or on-Hypervisor router. Larger L2 spans should be done only when required, and preferably with things like TRILL/SPB.