W&L Page 1 CCNA CCNA Training 2.6 Configure and verify VLANs Jose Luis Flores / Amel Walkinshaw Aug, 2015

W&L Page 2 CCNA LAN Switching Technologies 2.6 Configure and verify VLANs

W&L Page 3 CCNA Configure and verify VLANs

W&L Page 4 CCNA Configure and verify VLANs

W&L Page 5 CCNA Configure and verify VLANs Switch# configure terminal Switch(config)# vlan 20 Switch(config-vlan)# name test20 Switch(config-vlan)# end

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W&L Page 7 CCNA Configure and verify VLANs Switch# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)# interface fastethernet0/1 Switch(config-if)# switchport mode access Switch(config-if)# switchport access vlan 2 Switch(config-if)# end

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W&L Page 9 CCNA Configure and verify VLANs

W&L Page 10 CCNA Configure and verify VLANs The 802.1Q trunks impose these limitations on the trunking strategy for a network: In a network of Cisco switches connected through 802.1Q trunks, the switches maintain one spanning-tree instance for each VLAN allowed on the trunks. Non-Cisco devices might support one spanning-tree instance for all VLANs. When you connect a Cisco switch module to a non-Cisco device through an 802.1Q trunk, the Cisco switch module combines the spanning-tree instance of the VLAN of the trunk with the spanning-tree instance of the non-Cisco 802.1Q switch module. However, spanning-tree information for each VLAN is maintained by Cisco switches separated by a cloud of non-Cisco 802.1Q switches. The non-Cisco 802.1Q cloud separating the Cisco switches is treated as a single trunk link between the switches. Make sure that the native VLAN for an 802.1Q trunk is the same on both ends of the trunk link. If the native VLAN on one end of the trunk is different from the native VLAN on the other end, spanning-tree loops might result. Disabling spanning tree on the native VLAN of an 802.1Q trunk without disabling spanning tree on every VLAN in the network can potentially cause spanning-tree loops. We recommend that you leave spanning tree enabled on the native VLAN of an 802.1Q trunk or disable spanning tree on every VLAN in the network. Make sure that your network is loop-free before disabling spanning tree.

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W&L Page 12 CCNA Configure and verify VLANs CommandPurpose switch# show running-config vlan [ vlan_id | vlan_range ] Displays VLAN information. switch# show vlan [ brief | id [ vlan_id | vlan_range ] | name name | summary ] Displays selected configuration information for the defined VLAN(s).

W&L Page 13 CCNA Bibliography

W&L Page 14 CCNA Q&A