Troubleshooting TechNotes
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- Unicast Flooding in Switched Campus Networks 08/Feb/2016
- Multicast Catalyst Switches Support Matrix 26/Feb/2019
- Understanding VLAN Trunk Protocol (VTP) 26/Jan/2024
Clustering
Configuration
Connecting Terminal/Modem to Console
Connectors and Cabling
EtherChannel
General Connectivity
Multicast
Spanning Tree Protocol
VLAN and VTP
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- Cisco Small Form-Factor Pluggable (SFP) Transceiver Modules Maintenance and Troubleshooting (PDF - 345 KB) 23/Sep/2014
- Troubleshooting Cisco Catalyst Switches to NIC Compatibility Issues (PDF - 183 KB) 19/Sep/2014
- Common Causes of Slow IntraVLAN and InterVLAN Connectivity in Campus Switch Networks 16/Nov/2007
- Configuring a Management IP Address on Catalyst 4500/4000, 5500/5000, 6500/6000, and Catalyst Fixed Configuration Switches 15/Mar/2006
- Configuring and Troubleshooting Ethernet 10/100/1000Mb Half/Full Duplex Auto-Negotiation 04/Dec/2024updated
- Configuring Secure Shell on Routers and Switches Running Cisco IOS 06/Dec/2024updated
- Connecting a Modem to the Console Port on Catalyst Switches 12/Feb/2019
- Errdisable Port State Recovery on the Cisco IOS Platforms 19/Aug/2024
- Inter-Switch Link and IEEE 802.1Q Frame Format 25/Aug/2006
- Managing Software Images and Working with Configuration Files on Catalyst Switches 15/Oct/2009
- Network Address Translation Catalyst Switch Support Matrix 05/Apr/2006
- Output Drops Due to QoS on Access Layer Switches Troubleshooting TechNote 18/May/2013
- Spanning Tree Protocol Problems and Related Design Considerations 09/May/2024
- Spanning Tree Protocol Root Guard Enhancement 13/Dec/2024
- System Requirements to Implement Gigabit Ethernet on Catalyst Switches 20/Dec/2005
- System Requirements to Implement Trunking 10/Aug/2006
- Troubleshoot Catalyst Switches to NIC Compatibility Issues 27/Oct/2009
- Troubleshooting LAN Switching Environments 02/Dec/2022
- Troubleshooting Spanning Tree PVID- and Type-Inconsistencies 14/Mar/2024
- Troubleshooting STP on Catalyst Switches Running Cisco IOS System Software 28/Aug/2024
- Troubleshooting Transparent Bridging Environments 04/Oct/2005
- Understanding and Configuring Backbone Fast on Catalyst Switches 19/Apr/2016
- Understanding and Configuring the Cisco UplinkFast Feature 18/Aug/2008
- Understanding the Cisco IP Phone 10/100 Ethernet In-Line Power Detection Algorithm 15/Aug/2006
- Multicast Catalyst Switches Support Matrix (PDF - 133 KB)
- Troubleshooting STP on Catalyst Switches Running Cisco IOS System Software (ZIP - 76 KB)
- Troubleshooting Spanning Tree PVID- and Type-Inconsistencies (ZIP - 69 KB)
Support Documentation
Troubleshooting