6.1 VLAN Issues
6.1.2 Inter-VLAN issues and solutions

When VLANs are connected together, several technical issues will arise. The following are some of the most common issues and solutions that arise when trying to route between VLANs. The issues and solutions are as follows:

PROBLEM RESOLUTION
Isolated collision domains Route Processors
Need of end-user devices to send nonlocal packets Default routes
Supporting multiple VLAN traffic across VLAN boundaries Inter-Switch Link (ISL)
Lab Activity
  In this lab activity, you will learn how to configure an external router to route Inter-VLAN traffic (Router-on-a-Stick).