RackSwitch G8000 Application Guide

Routing Between IP Subnets

The physical layout of most corporate networks has evolved over time. Classic hub/router topologies have given way to faster switched topologies, particularly now that switches are increasingly intelligent. The G8000 is intelligent and fast enough to perform routing functions on a par with wire speed Layer 2 switching.

The combination of faster routing and switching in a single device provides another service— it allows you to build versatile topologies that account for legacy configurations.

For example, consider the following topology migration:

Server

Subnet

InternetI t t

InternetI t t

 

Server

Subnet

G8000

Figure 8-1The Router Legacy Network

In this example, a corporate campus has migrated from a router-centric topology to a faster, more powerful, switch-based topology. As is often the case, the legacy of network growth and redesign has left the system with a mix of illogically distributed subnets.

BMD00041, November 2008

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Blade ICE G8000 manual Routing Between IP Subnets, 1The Router Legacy Network