Dell PowerSwitch S5212F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 723

Benefits of a BGP EVPN-based VXLAN • Eliminates the flood-and-learn method of VTEP discovery by enabling control-plane learning of end-host L2 and L3 reachability information. • Minimizes network flooding of unknown unicast and broadcast traffic through EVPN-based MAC and IP route advertisements on local VTEPs. • Provides support for host mobility. BGP EVPN compared to static VXLAN OS10 supports two types of VXLAN NVO overlay networks: • Static VXLAN • BGP EVPN Configure and operate static VXLANs and BGP EVPNs for VXLAN in the same way: • Manually configure the overlay and underlay networks. • Manually configure each virtual network and VNI. • Manually configure access port membership in a virtual network. • Existing routing protocols provision and learn underlay reachability to VTEP peers. However, static VXLANs and BGP EVPNs for VXLAN differ as described: Table 25. Differences between Static VXLAN and VXLAN BGP EVPN Static VXLAN VXLAN BGP EVPN To start sending and receiving virtual-network traffic to and from a remote VTEP, manually configure the VTEP as a member of the virtual network. No manual configuration is required. Each remote VTEP is automatically learned as a member of a virtual network from the EVPN routes received from the remote VTEP. After a remote VTEP address is learned, VXLAN traffic is sent to, and received from, the VTEP. Data packets learn remote hosts after decapsulation of the VXLAN Remote host MAC addresses are learned in the control plane using header in the data plane. BGP EVPN Type 2 routes and MAC/IP advertisements. VXLAN BGP EVPN operation The EVPN address family allows VXLAN to carry EVPN routes in External Border Gateway Protocol (eBGP) and Internal Border Gateway Protocol (iBGP) sessions. In a data center network, use eBGP or iBGP for route exchange in both the IP underlay network and EVPN. The following sample BGP EVPN topology shows a leaf-spine data center network where eBGP exchanges IP routes in the IP underlay network, and exchanges EVPN routes in the VXLAN overlay network. All spine nodes are in one autonomous system-AS 65535. All leaf nodes are in another autonomous system-AS 65000. To advertise underlay IP routes, eBGP peer sessions establish between the leaf and spine nodes using an interface IP address. To advertise EVPN routes, eBGP peer sessions between the leaf and spine nodes use a Loopback IP address. VXLAN 723