TAILIEUCHUNG - Etherchannel LAN Switching Troubleshooting

The primary function of the spanning-tree algorithm (STA) is to cut loops created by redundant links in bridged networks. The Spanning-Tree Protocol (STP) operates at Layer2 of the OSI model and, by the means of bridge protocol data units (BPDUs) exchanged between bridges, elects the ports that will eventually forward or block traffic. This protocol can fail in some specific cases and troubleshooting the resulting situation can be very difficult, depending on the design of the network. The most important part of troubleshooting is done before the problem occurs | Lab Etherchannel LAN Switching Troubleshooting FastEthernet Fast0 1 Crossover Fast0 2 Connection ALSwitch 4006 L3 24 2900XL-Ent Fa 0 12 Client 24 Objective The primary function of the spanning-tree algorithm STA is to cut loops created by redundant links in bridged networks. The Spanning-Tree Protocol STP operates at Layer2 of the OSI model and by the means of bridge protocol data units BPDUs exchanged between bridges elects the ports that will eventually forward or block traffic. This protocol can fail in some specific cases and troubleshooting the resulting situation can be very difficult depending on the design of the network. The most important part of troubleshooting is done before the problem occurs. For this exercise utilize a systematic approach to troubleshooting Etherchannel Switch network. Scenario This network is not part of the International Travel Agency. As the Enterprise Network Administrator you have a small switched network with all clients existing in the same VLAN. There are currently no fault tolerant links in your network. You have several hosts communicating to each other between the distribution layer and access layer switches at 100MB full duplex. Your network administrator feels performance would improve if a second 100MB link between the distribution layer switches and the access layer switches were added. Your network administrator adds a new crossover cable between DLSwitch and ALSwitch and reports that communications between both switches has stopped however the rest of the network continues to operate. DLSwitch indicates the following message STP loop - channel 2 3-4 is disabled in vlan 1 You must investigate the Spanning-Tree configuration and Port-Channels to ensure proper configuration. 1-5 Semester 8 Internetwork Troubleshooting - Lab Copyright 2001 Cisco Systems Inc. Lab Tasks Build the network according to the diagram above. Cable the lab as shown in the diagram. Clear the DLRouter configuration

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