If you are familiar with the network when it is fully operational, you can be more effective at troubleshooting problems that arise. To understand the normal behavior of the network, monitor the network over a long period of time. During this time you can see a pattern in the traffic flow, such as which devices users access most or when peak usage times occur.
To identify problems, you can use a baseline analysis, which is an important indicator of overall network health. A baseline serves as a useful reference of network traffic during normal operation, which you can then compare to captured network traffic while you troubleshoot network problems. A baseline analysis speeds the process of isolating network problems. By running tests on a healthy network, you compile normal data for your network. You can compare this normal data against the results that you get when the network experiences trouble.
For example, ping each node to discover how long it typically takes to receive a response from devices on your network. Capture and save each response time and you can use these baseline response times to help you troubleshoot. You can also use the show tech and show khi performance {buffer-pool|cpu|memory|process|pthread|slabinfo} commands to obtain baseline output for normal system behavior.
Note
Depending on the hardware platform, the output of show khi performance memory command can differ.
In the following example, the show khi performance memory command shows the average memory utilization at various time intervals. The show khi performance memory history command shows the VMSize utilization values in kilobytes for each process at various time intervals. After 1 hour elapses, the system stores this information in /intflash/coreFiles/slot/khi_mem_log.
Switch:1#show khi performance memory
Slot:1Slot:1
Used: 1609636 (KB)
Free: 2396068 (KB)
Current utilization: 40 %
5-minute average utilization: 40 %
5-minute high water mark: 40 (%)
10-minute average utilization: 39 %
10-minute high water mark: 39 (%)
1-Hour average utilization: 37 %
1-Day average utilization: 0 %
1-Month average utilization: 0 %
1-Year average utilization: 0 %
Switch:1#show khi performance memory history
Slot:1
Values indicate VMSize in KB
Pid Pname 5-Min 10-Min 1-Hour 1-Day 1-Month 1-Year
4762 logger 1 1 1 -- -- --
4779 namServer 20 20 20 -- -- --
4780 sockserv 4 4 4 -- -- --
4782 oom95 214 214 214 -- -- --
4784 oom90 214 214 214 -- -- --
4786 imgsync.x 19 19 19 -- -- --
4860 logServer 24 24 24 -- -- --
4861 trcServer 18 18 18 -- -- --
--More-- (q = quit)
Switch:1#show tech
Sys Info:
---------------
General Info :
SysDescr : Switch (4.5.0.1_B008) (PRIVATE)
SysName : Switch
SysUpTime : 0 day(s), 00:49:06
SysContact : support@extremenetworks.com
SysLocation :
Chassis Info:
Chassis : 8608
Serial# : SDNI86CWD018
H/W Revision : R0D
H/W Config :
Part Number : EC9402001-E6
NumSlots : 8
NumPorts : 80
BaseMacAddr : f8:73:a2:03:80:00
--More-- (q = quit)