For a new deployment, you can build your BGP EVPN VXLAN fabric with IPv6 underlay. For an existing BGP EVPN VXLAN fabric with IPv4 underlay, you can seamlessly migrate to an IPv6 only or dual stack underlay. BGP EVPN VXLANv6 Fabric Support In Cisco IOS XE Dublin 17.10.1 and later releases, a BGP EVPN VXLAN fabric with an IPv6 underlay supports the following features:
• Ingress Replication or Static Multicast Replication • Layer 2 Gateway • Distributed Anycast Gateway with Symmetric Integrated Routing and Bridging • Layer 2 External connectivity with IEEE 802.1Q network • Layer 3 External Connectivity with VRF-Lite or MPLS Layer 3 VPN network • Seamless migration between EVPN VXLANv4 fabric and EVPN VXLANv6 fabric • IPv6 BGP EVPN Neighbor Peering EVPN VXLANv6 Layer 2 Overlay The Layer 2 Gateway with VXLANv6 deployment supports IPv6 transport in the underlay. The VXLAN tunnels and BGP peering between Layer 2 Gateways are both IPv6 based. The overlay has only Layer 2 routes. A Layer 2 Gateway with VXLANv6 supports Layer 2 bridging between Layer 2 Gateways.
Layer 3 Routing is implemented with the external Layer 3 Gateways. Figure 1: EVPN VXLANv6 Fabric with Layer 2 Gateway The topology in the figure shows a BGP EVPN VXLAN fabric with a Layer 2 overlay that supports IPv6 underlay. The fabric supports both IPv4 and IPv6 hosts. Configuring BGP EVPN VXLANv6 BGP EVPN VXLANv6 Fabric Support Configuring BGP EVPN VXLANv6 2