1. CCNA3: Switching Basics and Intermediate Routing v3.0 CISCO NETWORKING ACADEMY PROGRAM Chapter 8 – Virtual LANs Virtual LANs VLAN Concepts VLAN Configuration Troubleshooting VLANs

2. CCNA3: Switching Basics and Intermediate Routing v3.0 CISCO NETWORKING ACADEMY PROGRAM Chapter 8 – Virtual LANs Overview Created by software running on Layer 2 switches VLANs can be static or dynamic – responsibility of the network administrator Segment LANs into logical groupings e.g. by function, project team, application Users must be in the same VLAN as their workgroup server VLAN is a broadcast domain Traffic can be switched between VLANS with a router

3. CCNA3: Switching Basics and Intermediate Routing v3.0 CISCO NETWORKING ACADEMY PROGRAM Chapter 8 – Virtual LANs VLAN Operation Switches maintain a bridging table for each VLAN Switches can support multiple VLANs Switches perform filtering/forwarding based on VLAN ID

4. CCNA3: Switching Basics and Intermediate Routing v3.0 CISCO NETWORKING ACADEMY PROGRAM Chapter 8 – Virtual LANs Benefits of VLANs Create broadcast domains Control network traffic Increased security Workstations can be moved without needing reconfiguration

5. CCNA3: Switching Basics and Intermediate Routing v3.0 CISCO NETWORKING ACADEMY PROGRAM Chapter 8 – Virtual LANs VLAN Membership Port based MAC addressed based Protocol based Any VLAN is a layer 3 broadcast domain VLAN traffic between switches (trunks) is tagged (802.1q) or encapsulated (ISL) to identify VLAN membership

6. CCNA3: Switching Basics and Intermediate Routing v3.0 CISCO NETWORKING ACADEMY PROGRAM Chapter 8 – Virtual LANs VLAN IOS Configuration Example Switch#vlan database Switch(vlan)#vlan 2 Switch(vlan)#name marketing Switch(vlan)#exit Switch(config)#interface fastethernet 0/9 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 2

7. CCNA3: Switching Basics and Intermediate Routing v3.0 CISCO NETWORKING ACADEMY PROGRAM Chapter 8 – Virtual LANs Other VLAN/switching commands Switch#show vlan Switch#show vlan brief Switch#show spanning-tree Switch#Show interface