Cisco LAN Switching Fundamentals

Checking Hardware Components

After verifying that no issues can be found in software, check the hardware modules to ensure proper functioning. A physical check of the hardware can be helpful in situations where the hardware has failed. Sometimes, a faulty module may still show its LED indicator as green even though the switch software does not see the device; such inconsistency can help pinpoint the problem. It is very difficult to rely on physically checking devices because the switches are spread across the network. In most cases, the show module command is used to check the status of all the linecards in the Catalyst chassis. The status column displays whether the card is functioning, as shown in Example 12-2. If it is not, the status will ...