include Switches X and Y, and beyond. To resolve this problem, reconfigure Switch D for IEEE. Although a configuration change is necessary, it might not be sufficient to reestablish connectivity. There will be a reconvergence delay as devices exchange BPDUs and recompute a spanning tree for the network. Web Links VLAN Tech Notes http://www.cisco.com/en/US/tech/ tk389/tk689/ tech_tech_notes_ list.html

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Content Summary An understanding of the following key points should have been achieved:

• ISL and 802.1Q trunking
• Geographic VLANs
• Configuring static VLANs on 29xx series Catalyst switches
• Verifying and saving VLAN configurations
• Deleting VLANs from a switch
• Definition of VLANs
• The benefits of VLANs
• How VLANs are used to create broadcast domains
• How routers are used for communication between VLANs
• The common VLAN types
• A systematic approach to VLAN troubleshooting
• The steps for general troubleshooting in switched networks
• How spanning-tree problems can lead to broadcast storms
• Using show and debug commands to troubleshoot VLANs