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.
Centralized VXLAN gateway group deployment—Use one VTEP group that contains redundant centralized VXLAN IP gateways to provide reliable gateway services for VXLANs.
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.