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Datacenter: VXLAN vs OTV

Datacenter: VXLAN vs OTV

Today in our article we are going to discuss on VXLAN and OTV comparison. We already discuss about the basics of the VXLAN and the difference of VXLAN with the VLAN, QinQ. 

OTV- Overlay Transport Virtualization ?
Cisco OTV is an overlay protocol and used to simplifies extending Layer 2 applications across distributed data centers. We can implement Data Center Interconnect (DCI) between sites without altering or re-configuring your existing network design.

With OTV you can install virtual computing assets and clusters throughout physically spread data centers across the globe. OTV can provide you Transparent workload mobility, Business Resiliency and computing resources efficiency.

Fig 1.1- OTV in DC environment

VXLAN(Virtual Extensible Local Area Network)
As with VLAN today, VXLAN is designed to provide the same Ethernet Level 2 services as VLAN, but with greater extensibility and flexibility. In a large multitenant environment, VXLAN provides a flexible, multitenant solution over a shared physical infrastructure. It operates by using IP plus UDP to travel over the physical network.

VXLAN enables tenant workloads to be distributed across multiple physical pods in the datacenter by extending Layer 2 segments over shared network infrastructure.

VXLAN uses a 24-bit segment ID known as the VXLAN network identifier (VNID), which enables up to 16 million VXLAN segments to coexist in the same administrative domain.

Fig 1.2- VXLAN tunnels

VXLAN packets are transferred through the underlying network based on its Layer 3 header and can take complete advantage of Layer 3 routing, equal-cost multipath (ECMP) routing, and link aggregation protocols to use all available paths.

Let's check the difference between OTV and VXLAN below in a table.

Fig 1.3- OTV vs VXLAN


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