CCENT® Cisco Certified Entry Networking Technician ICND1 Study Guide Third Edition by Todd Lammle

Author:Todd Lammle [Lammle, Todd]
Language: eng
Format: epub
ISBN: 9781119288800
Published: 2016-06-14T00:00:00+00:00

Using the show processes Command

As I’ve said, you’ve really got to be careful when using the debug command on your devices. If your router’s CPU utilization is consistently at 50 percent or more, it’s probably not a good idea to type in the debug all command unless you want to see what a router looks like when it crashes!

So what other approaches can you use? Well, the show processes (or show processes cpu) is a good tool for determining a given router’s CPU utilization. Plus, it’ll give you a list of active processes along with their corresponding process ID, priority, scheduler test (status), CPU time used, number of times invoked, and so on. Lots of great stuff! Plus, this command is super handy when you want to evaluate your router’s performance and CPU utilization and are otherwise tempted to reach for the debug command!

Okay—what do you see in the following output? The first line shows the CPU utilization output for the last 5 seconds, 1 minute, and 5 minutes. The output provides 5%/0% in front of the CPU utilization for the last 5 seconds: The first number equals the total utilization, and the second one indicates the utilization due to interrupt routines. Take a look:

SW-1#sh processes CPU utilization for five seconds: 5%/0%; one minute: 7%; five minutes: 8% PID QTy PC Runtime(ms) Invoked uSecs Stacks TTY Process 1 Cwe 29EBC58 0 22 0 5236/6000 0 Chunk Manager 2 Csp 1B9CF10 241 206881 1 2516/3000 0 Load Meter 3 Hwe 1F108D0 0 1 0 8768/9000 0 Connection Mgr 4 Lst 29FA5C4 9437909 454026 20787 5540/6000 0 Check heaps 5 Cwe 2A02468 0 2 0 5476/6000 0 Pool Manager 6 Mst 1E98F04 0 2 0 5488/6000 0 Timers 7 Hwe 13EB1B4 3686 101399 36 5740/6000 0 Net Input 8 Mwe 13BCD84 0 1 0 23668/24000 0 Crash writer 9 Mwe 1C591B4 4346 53691 80 4896/6000 0 ARP Input 10 Lwe 1DA1504 0 1 0 5760/6000 0 CEF MIB API 11 Lwe 1E76ACC 0 1 0 5764/6000 0 AAA_SERVER_DEADT 12 Mwe 1E6F980 0 2 0 5476/6000 0 AAA high-capacit 13 Mwe 1F56F24 0 1 0 11732/12000 0 Policy Manager [output cut]

So basically, the output from the show processes command reveals that our router is happily able to process debugging commands without being overloaded—nice!

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