Data Center LAN Migration Guide - Juniper Networks
Data Center LAN Migration Guide - Juniper Networks
Data Center LAN Migration Guide - Juniper Networks
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3-TIER LEGACY NETWORK<br />
Ethernet<br />
Figure 1: Multitier legacy data center <strong>LAN</strong><br />
<strong>Data</strong> <strong>Center</strong> <strong>LAN</strong> <strong>Migration</strong> <strong>Guide</strong><br />
<strong>Data</strong> <strong>Center</strong> Interconnect<br />
WAN Edge<br />
Aggregation Layer<br />
This multitiered architecture, shown in Figure 1, worked well in a client/server world where the traffic was primarily “north<br />
and south,” and oversubscription ratios at tiers of the network closest to the endpoints (including servers and storage)<br />
could be high. However, traffic flows and performance requirements have changed considerably with the advent of<br />
applications based on SOA, increased mobility, Web 2.0, unified communications, compliance requirements, and the<br />
sheer number of devices connecting to the corporate infrastructure. Building networks today to accommodate 5 to 10<br />
year old traffic patterns is not optimal, and results in lower performance, unnecessary complexity, and higher cost.<br />
A new data center network design is needed to maximize IT investment and easily scale to support the new<br />
applications and services a high-performance enterprise requires to stay competitive. According to Gartner,<br />
“Established <strong>LAN</strong> design practices were created for an environment of limited switch performance. Today’s highcapacity<br />
switches allow new design approaches, thus reducing cost and complexity in campus and data center <strong>LAN</strong>s.<br />
The three-tier concept can be discarded, because all switch ports can typically deliver rich functionality without<br />
impacting performance.” 1<br />
Copyright © 2012, <strong>Juniper</strong> <strong>Networks</strong>, Inc. 7<br />
Core<br />
Access Layer<br />
Servers NAS FC Storage<br />
FC SAN<br />
1 Neil Rikard “Minimize <strong>LAN</strong> Switch Tiers to Reduce Cost and Increase Efficiency,” Gartner Research ID Number: G00172149 November 17, 2009