Duplex Mismatch Error
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SwitchingEthernetTroubleshoot and AlertsConfiguration Example and TechNotes Configuring and Troubleshooting Ethernet 10/100/1000Mb Half/Full Duplex Auto-Negotiation Print Available Languages Updated:Oct http://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/10561-3.html 28, 2009 Document ID:10561 Contents Introduction Prerequisites Requirements Components Used https://supportforums.cisco.com/discussion/10957496/duplex-mismatch-between-router-and-core-switch-cdp-4-duplexmismatch Conventions Difference Between CatOS and Cisco IOS System Software When to Use Ethernet 10/100 Mb Auto-Negotiation When to Use Ethernet 1000 Mb Auto-Negotiation Configure and Troubleshoot Ethernet 10/100Mb Auto-Negotiation on CatOS Switches Auto-Negotiation on Catalyst Switches that Run Cisco IOS Software Appendix A: Catalyst duplex mismatch Switch Modules Appendix B: Ethernet Crossover Cables Appendix C: Explanation of Auto-MDIX and Supported Switch Platforms Appendix D: Explanation of Fields in the show port {mod_num/port_num} Command show port Command Output Fields Appendix E: Frequently Asked Questions Related Information Introduction This document provides basic guidelines to isolate and resolve many common Ethernet auto-negotiation issues. This duplex mismatch cisco document provides a general description of auto-negotiation, and explains the procedure to configure and verify auto-negotiation on Catalyst switches that run the Catalyst OS (CatOS) system software. This document also shows an example of why the most common duplex-mismatch error occurs, and describes how to configure and verify auto-negotiation on Catalyst switches that run Cisco IOS System Software. Note:The new Catalyst switches/modules, such as the Catalyst 6500/6000, 4500/4000, 3550, and 2950, support 10/100/1000 Mbps negotiated Ethernet interfaces or ports. These ports work on 10 Mbps, 100 Mbps, or 1000 Mbps speed based on their connection to the other end. These 10/100/1000 Mbps ports can be configured for speed and duplex negotiation similar to 10/100 Mbps ports on CatOS or Cisco IOS Software-based switches. Therefore, the configurations described in this document for 10/100 Mbps port negotiation apply to 10/100/1000 Mbps ports as well. Prerequisites Requirements Cisco recommends that you have knowledge of these topics: Troubleshooting issues with 10/100 Network Interface Cards (NICs) Gigabit
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