Cisco Nexus 7000 Series Configuration Manual page 57

Configuring VXLAN BGP EVPN
Packet forwarding between servers belonging to different Layer-2 VNIs
In the below example, the source and target end hosts (Host A and Host F) belong to different Layer-2 virtual
networks (with VNIs 30000 and 30001). So, the traffic flow is between subnets, and hence routed. The VRF
VNI 50000 is used to route the traffic
Figure 11: Packet Forwarding (Route)
A high level overview of the flow is given below:
1 Host A sends traffic to its default gateway (post ARP resolution) which is configured on the directly
attached VTEP V1.
2 V1 performs a FIB lookup based on the destination IP address in the packet header.
3 VTEP V1 routes the packets and sends it toward VTEP V2 with a VXLAN header stamped with the VRF
(Layer 3) VNI 50000.
4 VTEP V2 receives the packets, and post decapsulation, routing lookup, and rewrite, sends them to Host
F.
Routing at the VTEP - A high level view
Mandatory configurations
1 A VLAN is configured for each segment - sending segment, VRF segment and receiving segment.
2 BGP and EVPN configurations ensure redistribution of this information across the VXLAN setup.
Real time behavior
End Host and Subnet Route Distribution
Cisco Nexus 7000 Series NX-OS VXLAN Configuration Guide
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