With the rapid evolution of SDN, industry have started to separate networks as Underlay and Overlay. An overlay is a virtual network that is built on top of an underlying network infrastructure, underlay. It is the underlying network responsibility to deliver packets across networks. Here are summary of Underlay and its characteristics; – Physical infrastructure which …
A new data center design called the Clos network–based spine-and-leaf architecture was developed to overcome these limitations. This architecture has been proven to deliver the high-bandwidth, low-latency, non-blocked links etc. CLOS topology basically have 2 tier, Spine (Core) and Leaf (Access). Every leaf switch is connected to all Spine switches. The spine layer is the …
In traditional data center networking the architecture consists of core routers, aggregation routers (sometimes called distribution routers), and access switches. Between the aggregation routers and access switches, Spanning Tree Protocol is used to build a loop-free topology for the Layer 2 part of network. This approach has several drawbacks including loops, unused links, unpredictable delays …