The following list of commands may help when troubleshooting router connections.
Use... |
To... |
router#show interfaces |
List a large set of information about each interface. |
router#show interface status |
View summary information about the interface status. |
router#show ip interfaces |
View a small set of information about each IP interface. |
router#show ip interfaces brief |
View a single line of information about each IP interface. |
router#show ip route <ip address> |
View details about the route the router would match for a packet sent to the listed IP address. |
router#show running-config |
View the currently running configuration file. |
router#show controllers <serial interface> |
View the serial interface configuration, such as the type of serial cable and which end of the cable is connected to the device (DCE or DTE). |
router#ping <ip address> |
Test communication with a specific interface using its IP address. |
You can use the interface status to understand connectivity problems and quickly see whether the link between the router and the network is operational. The following table summarizes some possible conditions indicated by the interface status:
Line status |
Protocol status |
Indicates... |
administratively down |
down |
The interface is configured with the shutdown command. |
down |
down |
There is a hardware or network connection problem (Physical layer), such as:
|
up |
down |
There is a connection or communication problem (Data Link layer), such as:
|
up |
up |
The interface is working correctly |
After verifying that the interfaces have Layer 1 and Layer 2 connectivity, proceed to troubleshoot TCP/IP connectivity including:
Be aware of the following when troubleshooting connectivity:
Credit: Testout 640-802 CCNA Notes
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