Users Guide

Table Of Contents
centralized Layer 3 gateway either directly or through an IP underlay fabric. Any Routing trac that is ingressing in a Layer 2 VTEP will be
switched to the Layer 3 centralized gateway and all routing decisions are taken in this centralized gateway and the trac is sent to the
destination Layer 2 VTEP.
The following VXLAN example also uses a Clos leaf-spine topology.In this example, the VTEP 1 and VTEP 2 VLT pair are L2 gateway and
VTEP 3 and VTEP 4 VLT pair are a centralized L3 gateway. The hosts Host A and Host B are connected to the L2 gateway. The L2
gateway is connected to a centralized L3 gateway through an IP underlay fabric. The IP address and Anycast IP address have to be
congured for the virtual networks in the centralized L3 gateway alone and need not be congured in the L2 gateways.
Routing for the client-originated Layer3 trac does not happen at the Layer2 VTEPs. These VTEPs are layer2 VTEPs and they forward
trac to a centralized gateway. This gateway is the Layer3 gateway that routes trac from one Layer2 segment to another.
Guidelines
If both Distributed routing and Centralized routing co-exist in the same environment, then a separate Gateway MAC need to be used for
the Centralized GW which is dierent from the common distributed GW MAC shared by all VTEPs.
VXLAN 899