H3C Technologies H3C S12500-X Series Switches - Manual (Page 67)

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Configuring VXLAN IP gateways
Overview
The following are available IP gateway placement designs for VXLANs:
• VXLAN IP gateways separate 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.
{
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.
In a collocation design, the VTEPs use virtual Layer 3 VSI interfaces as gateway interfaces to provide
services for VXLANs.
VXLAN IP gateways separate from VTEPs
As shown in Figure 12 , an independent VXLAN IP gateway connects a Layer 3 network to a VTEP. VMs
send Layer 3 traffic to the gateway through VXLAN tunnels. When the Layer 3 traffic arrives, 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.
Figure 12 VXLAN IP gateway separate from VTEPs