Most Useful Cisco Router Show Commands

Here is the Cisco router show commands list, which I use most when taking a look at routers…..

1. show running-config – when you need to see what the current router configuration is running.
2. show version – when you need to see IOS version, uptime, Flash size, Memory Size, and other useful details
3. show interface – when you need to see the status of the interfaces on the router; useful for troubleshooting as it tells you is the interface is up or down, input and output errors, last time counters were cleared, interface speed and duplex, etc.
4. show ip route – routing table!
5. show arp – MAC addresses and IP addresses
6. show tech-support – when you need to see everything important (be sure to log your session to a file); always send a copy when opening a TAC case, they will like you better if you do so
7. show vlan – shows you all the VLANs in your VLAN database as well as ports assigned to them
8. show ip interface brief – when you need to see the connection status of a lot of interfaces at once (also shows the IP)
9. show flash – to see what files (actual IOS bin file) are in flash; also shows space available
10. show access-lists – when you want a summary of the ACLs you have configured
11. show cdp neighbor – let’s see what other Cisco gear is connected to me (CDP has to be enabled on connected devices)
12. show log – let’s look at the log files; helpful when troubleshooting of course
13. show clock – What time is it?
14. show users – who are connected to this device? good to use before writing configs to memory

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