21
Configuring VXLAN IP gateways
Overview
The following are available IP gateway placement designs for VXLANs:
•
VXLAN IP gateways separated from VTEPs
—Use a VXLAN-unaware device as a gateway to
the external network for VXLANs. On the gateway, you do not need to configure VXLAN
settings.
•
VXLAN IP gateways collocated with VTEPs
—Include the following placement designs:
{
Centralized VXLAN IP gateway deployment
—Use one VTEP to provide Layer 3
forwarding for VXLANs. Typically, the gateway-collocated VTEP connects to other VTEPs
and the external network. To use this design, make sure the IP gateway has sufficient
bandwidth and processing capability. Centralized VXLAN IP gateways provide services only
for IPv4 networks.
{
Distributed VXLAN IP gateway deployment
—Deploy one VXLAN IP gateway on each
VTEP to provide Layer 3 forwarding for VXLANs at their respective sites. This design
distributes the Layer 3 traffic load across VTEPs. However, its configuration is more
complex than the centralized VXLAN IP gateway design. Distributed gateways can provide
services for both IPv4 and IPv6 networks.
In a collocation design, the VTEPs use virtual Layer 3 VSI interfaces as gateway interfaces to
provide services for VXLANs.
VXLAN IP gateways separated from VTEPs
As shown in
, an independent VXLAN IP gateway connects a Layer 3 network to a VTEP.
User terminals send Layer 3 traffic in Layer 2 frames to the gateway through VXLAN tunnels. When
the tunneled VXLAN packets arrive, the VTEP terminates the VXLANs and forwards the inner
frames to the gateway. In this gateway placement design, the VTEP does not perform Layer 3
forwarding for VXLANs.
