Four Data Center InterConnect (DCI) options for EVPN-VXLAN service are described in detail in the Advanced Data Center Switching (ADCX) course materials.
These options are:
- EVPN-VXLAN session over L3VPN-MPLS service;
- EVPN-VXLAN to EVPN-MPLS stitching;
- EVPN-VXLAN to EVPN-VXLAN stitching;
- EVPN-VXLAN session over dark fiber.
First and last options are not so interesting – simple EVPN-VXLAN session between DC devices over direct IP connectivity or via L3VPN service. Basic L3VPN/MPLS stuff.
But EVPN stitching is a slightly different story. Resembles Inter-AS VRF Option-A. Two EVPN domains are connected via Logical Tunnel (lt-) interfaces on MX device. Not very complex, but requires a lot of configuration. See it in the next post.