Most Useful Cisco Router Show Commands
Here is the Cisco router show commands list, which I use most when taking a look at routers…..
- show running-config – when you need to see what the current router configuration is running.
- show version – when you need to see IOS version, uptime, Flash size, Memory Size, and other useful details
- 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.
- show ip route – routing table!
- show arp – MAC addresses and IP addresses
- 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
- show vlan – shows you all the VLANs in your VLAN database as well as ports assigned to them
- show ip interface brief – when you need to see the connection status of a lot of interfaces at once (also shows the IP)
- show flash – to see what files (actual IOS bin file) are in flash; also shows space available
- show access-lists – when you want a summary of the ACLs you have configured
- show cdp neighbor – let’s see what other Cisco gear is connected to me (CDP has to be enabled on connected devices)
- show log – let’s look at the log files; helpful when troubleshooting of course
- show clock – What time is it?
- show users – who are connected to this device? good to use before writing configs to memory