Cisco Nexus 7000 Series Configuration Manual page 73

Configuring ACI WAN Interconnect
• For more details on ACI, refer to
ACI Basic Configuration
The VXLAN EVPN data center fabric can be connected across Layer 3 boundaries (to external sites and back)
using MPLS L3VPN, VRF IP Routing (VRF Lite), or LISP as the mechanism of transport outside the VXLAN
fabric. External Connectivity to the LISP DCI technology is documented in the
with VXLAN BGP EVPN Configuration
The ACI WAN Interconnect feature requires the MPLS package and the LAN enterprise package licenses.
Figure 17: ACI Fabric & L3VPN Hand-off
The MPLS L3VPN hand off scenario is explained below.
• •BGP-EVPN peering from DCI gateways to two spines in a POD.
• Spines advertise host OR prefix routes for hosts directly behind a leaf, with the Spine Any-cast IP VTEP
(IP-s) as the next-hop. These are mostly public BD subnets advertised to outside world.
• Spines can relay a transit route advertised by ACI leafs with leaf VTEPs as next-hops to be used as
ECMP paths.
• North-to-South traffic tunneled from DCI to Spine any-cast IP (can land on any of the Spines) or the
ECMP is tunneled directly to advertise ACI-leaf VTEPs.
• North-to-South traffic tunneled to Spine will get routed on spine-to-leaf based on /32 lookup.
• Routes advertised from DCI to Spine will get reflected to leaves with the DCI VTEP as the next-hop.
Overview of VXLAN EVPN - MPLS L3VPN for ACI Fabric
Cisco Application Centric Infrastructure Fundamentals guide
Guide.
Guide.
Cisco Nexus 7000 Series NX-OS VXLAN Configuration Guide
and Cisco
Cisco Programmable Fabric
65