VLANs are a fairly straightforward feature which rarely requires troubleshooting. A few of the problems that you will see are mostly configuration errors. We will cover Layer 2 troubleshooting in detail on Day 15. Common problems include the following:
- Inter-VLAN routing not working: Check to ensure that the link between the switches and the routers is set up correctly, and the relevant VLANs are allowed and not pruned (see VTP pruning). The show interface trunk command will provide the required information. Also, check to ensure that the router’s subinterfaces are configured with correct encapsulation and VLAN . . .
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