Unlike Layer 3 topology which is mainly derived from configurations, layer2 (L2) topology is discovered from live data such as CDP table, ARP table and MAC table. Before working on any L2 feature, you must discover L2 topology. The discovery result is the switch connection table and global one IP table. You can create a L2 Q-map as a graphic representation of L2 connections.

 

 

This chapter covers the following topics:

Working with Layer 2 topology

Mapping Layer 2 Topology

Understanding Layer 2 design