Lab 1-2: Troubleshooting Switch Media Issues

Visual Topology

Command Lis

Command Description
Configure Terminal Enters global configuration mode.
Copy run start Saves the dynamic running-config to NVRAM.
Duplex full / Half / Auto Enables the interface duplex setting.
Enable Enters privilege EXEC mode
Interface Fastethernet 0/0 Specifies interface fa0/0
Interface Gigabitethernet 0/0 Specifies interface gi0/0
Shutdown/ No Shutdown Disables or enable an interface
Ping ip-address or hostname Checks IP connectivity
Show Interface Fastethernet 0/0 Displays information about interface fa0/0
Show Interface Gigabitethernet 0/0 Displays information about interface gi0/0
Show IP Interface Brief Displays a brief summary of the device interfaces
Speed 10/100/1000/auto Sets the speed of an interface

Physical Topology Diagram

  • Task 1: Lab setup.
  • Task 2: Connectivity issues between the PC and the Switch.
  • Task 3: Connectivity issues between the Switch and the Router.

Lab 1-2: Troubleshooting Switch Media Issues

Task 1: Lab setup.

Step 1: Make sure that interfaces fa0/3, fa0/4 and fa0/11 are shutdown on your Switch.

Task 2: Connectivity issues between the PC and the Switch.

Step 1: Check the connectivity between the PC and the Switch using the Ping command, if the Ping fails check the status of Switch interface fa0/1 and verify that its status is up/up. If the interface is administratively down issue the No Shutdown command to bring it up.

Step 2: Enter the correct interface mode for the Switch SVI (management interface ) and shut the interface down. Check the IP connectivity between the PC and the Switch, this should now fail.

Enable the SVI (management interface) and check that IP connectivity has been restored.

Task 3: Connectivity issues between the Switch and the Router.

Step 1: Check that interface fa0/12 on the Switch isn’t administratively shutdown, rectify if it is.

Step 2: Access the console port of the Router using the access method described by the instructor.

Give the router a hostname of R1 or R2

Step 3: Enter the interface configuration mode this will be either fa0/0 if you are using a 2811 Router or gi0/0 if you are using a 2901 Router.

Give the interface an IP address of either 10.1.1.1/24 (R1 only) or 10.1.1.2/24 (R2 only).

Try and Ping the IP address of your switch. Was this successful?

If not check the status of the interface, what do you notice?

Rectify the condition and try to Ping the switch again. Only when you have full IP connectivity between the Router and the Switch move on to the next step.

Step 4: Access the interface (fa0/0 or gi0/0) configuration mode on the Router and change the speed setting to 10, now access the CLI on the Switch and enter the interface fa0/12 configuration mode and set the speed to 100.

Check the status of the interfaces connecting the Switch and Router together, make a note of their layer 1 and layer 2 states.

Would you expect connectivity when there is a speed mis-match?

Reconfigure the Router (interface fa0/0 or gi0/0) to match the speed of the switch, remember best working practice suggests you shutdown the interface before making any changes and after you have reconfigured the interface enter the no shut command.

Verify connectivity before moving on to the next step.

Step 5: Configure Switch interface fa0/12 to half duplex and configure Router interface (fa0/0 or gi0/0) to full duplex.

Check the layer 1 and layer 2 status of the connecting interfaces and record your results below.

Once you are ready to move on, reconfigure Switch interface fa0/12 to full duplex, check IP connectivity and save your running-config on both devices.

Lab Answer Keys:

Recommended For You

About the Author: Linux Tips

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.