About VXLANs
Netvisor ONE provides traditional network segmentation using Virtual Local Area Networks (VLANs) and standardized under the IEEE 802.1Q group. VLANs provide logical segmentation of the network at Layer 2 or broadcast domains. Due to less than optimal use of available network links with VLANs, rigid requirements exist for the placement of devices in the network and the scalability limited to a maximum of 4096 VLANs. Using VLANs becomes a limiting factor when building large multi-tenant data centers.
Virtual Extensible LANs (VXLAN) design provides the same Ethernet Layer 2 network services as VLANs but with greater extensibility and flexibility. When compared to VLANs, VXLANs offer the following benefits:
Flexible placement of multi-tenant segments through the data center, because the feature provides a solution to extend Layer 2 segments over the underlying shared network infrastructure and tenant workload load balances across physical pods in the data center.
Increased scalability to address more Layer 2 segments as VXLANs use a 24-bit segment ID known as the VXLAN Identifier (VNID) which enables up to 16 million segments to coexist in the same administrative domain.
Improved utilization of available network paths in the underlying infrastructure since VXLAN packets transfer through the underlying network based on the Layer3 header. This takes advantage of Layer 3 routing, equal-cost multipath (ECMP) routing, and link aggregation protocols to use all available paths.
As a Layer 2 overlay scheme over a Layer 3 network, VXLANs uses MAC Address-in-User Datagram Protocol (MAC-in-UDP) encapsulation to provide a means to extend Layer 2 segments across the data center network. VXLAN supports a flexible, large-scale multi-tenant environment over a shared common physical infrastructure. VXLANs use IP plus UDP as a transport protocol over the physical data center network.
Netvisor ONE supports VXLANs on non-redundant and redundant spine-leaf topology. VXLAN configuration at high level involves 5 major steps in addition to VLAN, trunk, vLAG, and vRouter configuration as needed.