When users complain that the network is slow(the organizational network,aka "intranet") what show commands can i use in the switch and on what fields/parameters should i look that can point out that there is a congestion problem(the network is slow..)?
Also "Show interface" command is usful in such cases in order to know if you have congestion or not., but keep in mind that this values changes every 55 minutes by default, but you can use the below command to reduce such interface to 30 seconds instead of 5 minutes.
Chekc the input/output rate
Router#show int g0/0 | inc 30 sec
30 second input rate 367000 bits/sec, 68 packets/sec
30 second output rate 529000 bits/sec, 75 packets/sec
you can get an instantaneous look at your interfaces and how much traffic is passing for all your interfaces using the "show interface summary" command . Easy to look at and see in bps how much is being tranferred . For fixed config switches the show controllers utilization is a useful command to see utilization % of all switchports and the switch fabric itself.
you could also enable NBAR to analyze the traffic for a few days to see what people are doing. If you have people on your network using P2p file sharing programs, or streaming a ton of video, you cold create QoS policies to give priority to important traffic while minizming bandwidth to less important traffic.
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