Overlay Routing
Tenants may have multiple overlays across a data center network
where different VLANs belonging to the same tenant are mapped to different VXLAN Network
Identifiers (VNIs). Tenants require routing between the VLANs, and VXLAN gateway nodes would need
to act as Layer 3 gateways that are capable of routing traffic between tenant VLANs.
Inter-overlay routing involves routing:
- Routing traffic from a tenant VLAN into a tunnel with the destination
overlay‘s VNI.
- Routing traffic from a tunnel to a tenant VLAN that is different from
the tenant VLAN associated with the VNI in the received packet‘s VXLAN header.
- Routing traffic from a tunnel to the same or different tunnel.
A VXLAN tunnel endpoint (VTEP) is designated as the gateway for an overlay by manually
configuring it or by running a first hop redundancy protocol (FHRP), such as
VRRP (Virtual Router Redundancy Protocol) on the tenant VLAN on the
gateways and letting the protocol determine the placement of the router.
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