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New Contributor III

3120 - High CPU Utilization and slowness

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HI all- First Post.

Please bear with me. I am not an IT expert.

We have Ethernet over Copper 6M from Telepacific.

Recently I upgraded from a Bonded T1 (3M) and had an older Adtran. But to use this new service we had to install our own router. I bought and installed, with the assistance of a good Network Tech (who is unavailable this week), this ADTRAN 3120. The previous Adtran switch was managed by my providor. And they took it back. It had served us well for about 6 years anyhow.

This router has been in for about 2 months now. I now have to "manage"  - this router.

Today we are seeing slow speeds "verified" via speedtest.net

Usually very consistently we are right near 5.70 Down 5.20 Up  when there is typical usage in our network.

Today under 4.00 Down 3.50 Up

I was hoping someone can suggest something fairly simple to try to troubleshoot this.

I do not know what would cuase CPU usage, nor do I really understand exactly how it affects our throughput.

Thank You very much for any help.

James:

-------

Here is my Summary:

adtran-summary.jpg

Here is my CPU Utilization summary..

Screen Shot 2012-08-13 at 4.33.22 PM.png

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Re: 3120 - High CPU Utilization and slowness

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James, I have reviewed your config.  The IP FLow/Top Traffic is causing the high CPU usage. To keep ITM memory and and CPU usage to a minimum, RapidRoute must be enabled on each interface to be monitored using the ip ffe command from the interface configuration mode. I would recommend you take a look at this pdf link below,  also there is some sampling configurations that may alleviate some of the CPU use.  You can verify the IP flow is using up the CPU by disabling the traffic monitoring and then view CPU tasks.

https://supportforums.adtran.com/docs/DOC-1642

Configuring Integrated Traffic Monitoring (ITM) in AOS

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Re: 3120 - High CPU Utilization and slowness

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It is unusal to see PC config that high on a 3120 unless you are doing some QoS for Voice or RTP monitoring.  Can you post a copy of your config.  Please make sure you replace any Public IP addresses with "Public IP" and remove any secure information.  It is possible there is some misconfiguration.  Is this something that you verifed today or is this something that could have been happening since you deployed the new router/configuration.

New Contributor III

Re: 3120 - High CPU Utilization and slowness

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Thanks for your Reply. Here is my Config file - Sanitized

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Re: 3120 - High CPU Utilization and slowness

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James, I have reviewed your config.  The IP FLow/Top Traffic is causing the high CPU usage. To keep ITM memory and and CPU usage to a minimum, RapidRoute must be enabled on each interface to be monitored using the ip ffe command from the interface configuration mode. I would recommend you take a look at this pdf link below,  also there is some sampling configurations that may alleviate some of the CPU use.  You can verify the IP flow is using up the CPU by disabling the traffic monitoring and then view CPU tasks.

https://supportforums.adtran.com/docs/DOC-1642

Configuring Integrated Traffic Monitoring (ITM) in AOS

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Re: 3120 - High CPU Utilization and slowness

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Thanks a lot!. I have looked at the doc. I'll have to digest that further. I think for today, as you suggest, I'll turn off all Monitoring and note the difference..

When you mention to use the command ip ffe that would be if I was connected via the console?

Thanks very much for your help on this!

----UPDATE

I turned off all Monitoring and am still seeing 99.00% loads.. 😞

Attached is my Config File.

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New Contributor III

Re: 3120 - High CPU Utilization and slowness

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One note. I tried to "Clear CPU Max Load" in the Summary GUI and got an  Error dialog Error trying to clear CPU MAX LOAD.

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Re: 3120 - High CPU Utilization and slowness

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Sorry for the delay, all night server work.  Yes from the comand line interface.  You can either connect by console or go to GUI>Utilities and select telnet.  Alternately you can connect by telnet with Putty or fom the command line.  Once at the command line you will enter the following.

Router>

Router#

Router#config t

Router(config)interface eth 0/1

Router(config-int)ip ffe           and then hit enter

UPDATE

I just read your update portion.  Config looks totally clean.  You may want to contact support at this point, they can walk you through the debug process to see what is causing the issue.  I have only had 1 out of nearly a 100 of these routers have this issue and it was replaced after debug.

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New Contributor III

Re: 3120 - High CPU Utilization and slowness

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OK thanks a lot.. I'll contact them now.

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Re: 3120 - High CPU Utilization and slowness

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Update. After turning off monitoring it semeed to take about 24 hours or so for the changes to take effect. I am now seeing:

System Load: 15.14%

1 Min Avg Load: 44.41%     5 Min Avg Load: 27.25%

Min Load: 0%     Max Load: 100%

Context Switch Load: 0.25%


So the Monitoring without the proper RapidRoute enabled was using all of my processing power.

Thanks for the tip. For now I am running it without monitoring as I dont really need it. It was more a curiosity to me in this case.

SOLVED


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Re: 3120 - High CPU Utilization and slowness

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A further update:

I tried to use the Telnet commands you entered to turn on the RapidRoute

I logged in and

was prompted:

NetVanta3120>

Following your instructions:

I got unknown commands for 

Router >

Router #

config t

Does "Router>" represent my Router prompt? Such as:

NetVanta3120>

If so entering

>

or

#

or

config t

always gives me

% Unrecognized command

All I get is a periodic summary:

2012.08.23 11:20:27 FIREWALL id=firewall time="2012-08-23 11:20:27" fw=NetVanta3120 pri=1  proto=http src=00.00.00.00 dst=00.00.00.00 msg="TCP connection request received is invalid (expected SYN, got ACK), dropping packet; flags=0x11 Src 1689 Dst 80 from Private policy-class on interface vlan 1" agent=AdFirewall

I can see that it is reporting some most recent activity of some kind (00.00.00.00)

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