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If you are experiencing slow performance or intermittent connection problems, you should first check the statistics on the interfaces of your switch with the show interfaces command Are you seeing a high number of errors, such as collisions A few things can cause these problems The most common is a mismatch in either the duplexing or the speed on a connection Examine the settings on both sides of the connection Also make sure that you are using the correct cabling type: straight for a DTE-to-DCE connection and crossover for a DTE-to-DTE or DCEto-DCE connection (as covered in 4) And make sure that the cable does not exceed the maximum legal limit Also, make sure that the connected IC is not experiencing a hardware problem or failure
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If you are attempting to access the console port of a switch or router, and all you see is garbage in your terminal session, this could indicate an incorrect terminal setting Usually the culprit is an incorrect baud rate Some devices allow you to perform an operating system upgrade via the console port, and an administrator might change it to the highest possible value but forget to change it back to 9600 bps If you suspect this, keep on changing your baud rate until you find the right speed If you are having problems accessing devices in the switched network, you can look at a few options First, is the device you are trying to reach in the same VLAN If so, make sure that you are using the correct IP addressing scheme in the VLAN and that the two devices trying to share information have their ports in the same VLAN If the two devices are Cisco devices, you can use CDP to elicit some of this information, for instance the IP address, by using the show cdp commands (discussed in 17) Is the switch learning about the devices in your network You might want to examine your CAM tables and make sure that a port security violation is not causing your connectivity problem (see 12) For VLAN information, use the show commands on your switches to check your VLAN configuration Also check the VLAN configuration on each switch and make sure the VLANs are configured with the same parameters by using the show vlan command If the port LED is solid amber, your problem could be that the port s VLAN was deleted and the port wasn t reassigned Other problems can also cause the port LED to turn amber, such as STP placing the port in a blocking state ( 14) or port security has disabled the port because of a security violation ( 12) Actually, if you see that a lot of port LEDs are amber, a deleted VLAN is probably the problem Use the show interface switchport command to determine whether a deleted VLAN is the problem: if you see that the VLAN assigned to the port is inactive, like this, then you ve identified the culprit:
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switch# show interface fastEthernet0/1 switchport Name: Fa0/1 Switchport: Enabled Administrative mode: static access Operational Mode: static access Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: Off Access Mode VLAN: 5 (Inactive) Trunking Native Mode VLAN: 1 (default)
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13: VLANs and Trunks
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Notice that in the above example VLAN 5 is inactive, indicating that the interface is assigned to the VLAN, but the VLAN was deleted, making the interface inoperable If you are using trunks between the switches, make sure that the trunks are configured correctly: show interface trunk Make sure that the native VLAN number matches on both ends of the trunk: if they are mismatched, a trunk will not form Also check VTP (if you are using it) by executing the show vtp commands Make sure you have trunk connections between your switches, since VTP messages only traverse trunks When using a server/client implementation, make sure that the domain name and, if using the password option, the password match among the VTP switches Also, all switches must be running the same VTP version (by default this is version 1)
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