Troubleshooting TechNotes
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- Unicast Flooding in Switched Campus Networks 08/Feb/2016
- Multicast Catalyst Switches Support Matrix 26/Feb/2019
Architecture
Configuration
Connecting Terminal/Modem to Console
Connectors and Cabling
CPU Utilization
EtherChannel
General Connectivity
Jumbo/Giant Frame
Multicast
Quality Of Service(QoS)
Recovery from Corrupted or Missing Software
Security
Spanning Tree Protocol
Switch Port Problems
VLAN and VTP
Web Interface
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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
- ACL and QoS TCAM Exhaustion Avoidance on Catalyst 4500 Switches 27/Oct/2005
- Best Practices for Catalyst 4500/4000, 5500/5000, and 6500/6000 Series Switches Running CatOS Configuration and Management 29/Nov/2007
- Catalyst 6500, 4500, and 3750 Series Switches EtherChannel Load-Balancing 25/Jul/2013
- Common Causes of Slow IntraVLAN and InterVLAN Connectivity in Campus Switch Networks 16/Nov/2007
- Common Issues with Catalyst 4500 Switches that Run Cisco IOS Software 13/Apr/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/2024
- Configuring Secure Shell on Routers and Switches Running Cisco IOS 06/Dec/2024
- Errdisable Port State Recovery on the Cisco IOS Platforms 19/Aug/2024
- Troubleshoot High CPU Utilization on Catalyst 4500 Switches 01/Aug/2023
- Determine the Serial Number of Catalyst Switch Components 29/Aug/2024
- How to Get Catalyst Switch Backplane Utilization Using SNMP 21/May/2006
- Upgrade Software Images on Catalyst Switch Layer 3 Modules 04/Dec/2006
- 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
- Spanning Tree Protocol Problems and Related Design Considerations 10/Jul/2025
- Spanning Tree Protocol Root Guard Enhancement 13/Dec/2024
- Supported Platforms for Unique MAC Address Configuration on VLAN or L3 Interfaces for Catalyst Switches 02/Mar/2007
- Troubleshoot Catalyst Switches to NIC Compatibility Issues 27/Oct/2009
- Troubleshooting Hardware and Related Issues on Catalyst 4500/4000 Switches Running Cisco IOS Software 05/Jun/2006
- Troubleshooting LAN Switching Environments 02/Dec/2022
- Troubleshooting Spanning Tree PVID- and Type-Inconsistencies 18/Aug/2025
- Troubleshooting STP on Catalyst Switches Running Cisco IOS System Software 28/Aug/2024
- Troubleshooting Transparent Bridging Environments 04/Oct/2005
- Trunking Between Catalyst 4500/4000, 5500/5000, and 6500/6000 Series Switches Using 802.1Q Encapsulation with Cisco CatOS System Software 26/May/2006
- Understanding and Troubleshooting the Autostate Feature in Catalyst Switches 06/May/2005
- Understanding and Tuning Spanning Tree Protocol Timers 02/Feb/2023
- Understanding EtherChannel Inconsistency Detection 11/Apr/2024
- Use of EEM Scripts to Monitor High CPU Utilization on Cisco Catalyst Series Switches 22/Nov/2017
- 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