TAILIEUCHUNG - Full Duplex-Half Duplex Misconfiguration (troubleshooting

Duplex mismatch on a point-to-point link is a very common configuration error. This occurs especially when one side of the link is hard-coded full duplex. If you leave the other side in auto-negotiation mode, it will often end up in half-duplex (a port with duplex hard coded, does not negotiate any more). This may not stop the communication between switches but it may cause several other problems such as packet loss or bridging loops. | Lab Full Duplex-Half Duplex Misconfiguration troubleshooting LAN switches Fast 2 3 Ethernet Fast0 1 Crossover Connection ALSwitch 24 2900XL-Ent DLSwitch 4006 L3 Fa 0 2 Client h Objective Duplex mismatch on a point-to-point link is a very common configuration error. This occurs especially when one side of the link is hard-coded full duplex. If you leave the other side in auto-negotiation mode it will often end up in half-duplex a port with duplex hard coded does not negotiate any more . This may not stop the communication between switches but it may cause several other problems such as packet loss or bridging loops. Scenario This is not part of the International Travel Agency network. As the Enterprise Network Administrator you add an access switch to your network for several workstations you have just installed. The switch has not been reconfigured since it was used in production to connect several hubs to your network. After connecting the access switch to your network distribution switch DLSwitch you console into the distribution switch and ping the access switch. The ping is successful. After all the workstations are connected several users complain that performance is very slow. Lab Tasks Clear the DLRouter configuration using the following commands Router erase start Erasing the nvram filesystem will remove all files Continue confirm y OK Erase of nvram complete Router reload Proceed with reload confirm y Clear the DLSwitch configuration using the following commands Console enable clear config all This command will clear all configuration in NVRAM. This command will cause ifIndex to be reassigned on the next system startup. Do you want to continue y n n y 1-4 Semester 8 Internetwork Troubleshooting - Lab Copyright 2001 Cisco Systems Inc. .2001 Jun 16 12 29 45 PAGP-5-PORTFROMSTP Port 2 1 left bridge port 2 1 .2001 Jun 16 12 29 45 PAGP-5-PORTFROMSTP Port 2 2 left bridge port 2 2 .2001 Jun 16 12 29 45 PAGP-5-PORTFROMSTP Port 2

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