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10 mostly used ‘show’ commands in Cisco routers!

The ‘show’ commands are the most widely used in Cisco routers until now. This is a list of the 10 mostly used ‘show’ commands….I always used it during troubleshooting process.

1. show running-config
This command shows the complete configuration that is running currently. Using it you can troubleshoot almost all issues regarding routing, filtering, secure access, and many other issues.

2. show startup-config
This command shows the configuration that is saved on the NVRAM. It is helpful in knowing the configuration that will be applied the next time the routers is reloaded.

3. show interface
This command shows status and statistics regarding interfaces. It is almost always needed in troubleshooting routing and link issues it shows interface IP address and subnet mask, interface status, encapsulation type, bandwidth, and many other important indicator about the interface operation.

4. show ip interface
This command shows information about IP protocol and the interface or to be specific it shows which access-lists are applied at the interfaces and in which direction. This kind of information is not shown by the ‘show access-list’ command.

5. show ip protocols
This command shows the routing protocols used in the router and what networks are these protocols advertising. It also shows the sources of routing updates received at this router. It is very useful in routing issues troubleshooting.

6. show ip route
This command shows the routing table. This table helps you in finding out the next hop for each and every routable packet.  It is very useful in routing issues troubleshooting.

7. show access-list
This command shows the contents of each access-list. It is very useful in troubleshooting filtering issues. Note that this command does not show you where each access-list is applied.

8. show cdp neighbor detail
This command shows information about the neighboring devices like IP addresses, platforms, and host names. It is very useful in troubleshooting connectivity issues.

9. show version
This command shows information about the IOS. It shows the file name of the IOS along with the version of the IOS and value of the configuration register. It is the only command used to show this register’s value.

10. show flash or show slot0:
This command shows the contents of the flash and the size of the IOS file(s) and the size of the flash and how much of it is free space. It is very useful in upgrading or installing the IOS file.

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