Useful Cisco Switch Commands (suitable for a 2950)

 Showing the Running configuration of the Switch. Example commands:
show run ' to see the conplete switch running
confige
show run int f0/1 ' to see running confige on
FastEthernet, slot 0, port 1
show run int vlan x ' where x = the management vlan for the
switch
show int status ' show basic interface configuation
information


Saving the Switch Running Configuation. Example command:
copy run start


Dealing with Switch Logging. Example commands:
service timestamps debug datetime localtime
service timestamps log datertime localtime
logging buffered

clear log ' clear logs if they have been on for a
long period of time
show log ' see see the switch logs


Setting the switch clock:
show clock ' to see the clock settings
clock set hh:mm:ss d m y ' clock set 14:10:55 9 sept 2005


Finding out the general topology of the connecting network. Example
commands:
show cdp ne ' for an overview
show cdp ne de ' to be more specific. This gives the
neighbour IP address


Managing the ARP:
show arp ' to see the ARP table
clear arp ' to clear the ARP table


Troubleshooting connectivity issues:
ping x.x.x.x ' ping a known address 5 times. There should
be a quick response.
ping ' extended ping, followed by return to do an
extended ping test. Can state no. of pings
trace x.x.x.x ' to do a trace route to an IP address


Looking at the Switch counters:
clear counters ' to clear all switch counters
show int counters ' to see all interface counters
show int counters error ' to see errors on all the interfaces
show int fa0/22 ' to see errors on a particular
interface

So how fast are Ports running:
show proc cpu
sh cont util


Making changes:
config t ' to go into configuration mode
int range f0/1 - 10 ' to set changes to be make to a range
of ports
speed 100 ' to set the speed of the port to 100Mb
duplex full ' to set the line duplex to full, half
or auto


Setting up the Banner:
config t
banner motd ^C

^C

Working with VLAN's:
show vlan
show vtp status
vlan database
vtp transparent|server|client ' Choose wisely here!! Swithces come
out of the box in Server mode!!!

The source of the picture above is from here.