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sitolino
Paper Tape
Posts: 8
Registered: ‎05-15-2019
Location: BR
Views: 291
Message 1 of 16

Lenovo RackSwitch G8272

Hello,
This is my first time on this forum. I'm having a problem with a G8272 switch. The processing of this is auto and the command "show processes cpu" presents the following:
---------------------------------------------------------------------

CPU Utilization at 05:11:44 Thu Jan 31, 2019

Total CPU Utilization: For 1 second: 75.98%
For 5 second: 74.61%
For 1 minute: 74.92%
For 5 minute: 74.43%

Highest CPU Utilization: thread 99 (ARP ) at 17:24:32 Sun Jun 17, 2018

---------------------------------------------------------------------
Thread Thread Utilization Status
ID Name 1sec 5sec 1Min 5Min
---------------------------------------------------------------------
1 STEM 0.00% 0.00% 0.00% 0.00% idle
2 STP 1.55% 1.68% 1.84% 1.84% idle
3 MFDB 0.00% 0.00% 0.00% 0.11% idle
4 TND 0.00% 0.00% 0.00% 0.00% idle
5 CONS 30.99% 32.15% 31.56% 32.10% resumable
6 TNET 0.02% 0.02% 0.08% 0.03% running
7 TNET 0.00% 0.00% 0.00% 0.00% idle
8 TNET 0.00% 0.00% 0.00% 0.00% idle
9 TNET 0.00% 0.00% 0.00% 0.00% idle
10 TNET 0.00% 0.00% 0.00% 0.00% idle
11 TNET 0.00% 0.00% 0.00% 0.00% idle
12 LOG 32.61% 33.81% 33.18% 33.76% resumable
13 TRAP 0.00% 0.00% 0.00% 0.00% idle
What does the resumable stauts for thread ID 5 and 12 mean?
How can I solve this problem?

Lenovo Employee JVOSS2
Lenovo Employee
Posts: 254
Registered: ‎07-17-2018
Location: US
Views: 285
Message 2 of 16

Re: Lenovo RackSwitch G8272

Hello sitolino,

 

Welcome to the community!

 

What kind of problem are you running into? Are you seeing network degradation?

 

Would it be possible to attach a "show tech" to the post?

sitolino
Paper Tape
Posts: 8
Registered: ‎05-15-2019
Location: BR
Views: 264
Message 3 of 16

Re: Lenovo RackSwitch G8272

The network management software has generated an alarm. Apparently there is no degradation of the network under normal conditions.

Attached the file.

Highlighted
Lenovo Employee JVOSS2
Lenovo Employee
Posts: 254
Registered: ‎07-17-2018
Location: US
Views: 254
Message 4 of 16

Re: Lenovo RackSwitch G8272

This log appears every 2 minutes (to the second most of the time):

 

system: Protocol control discards: arp-bcast or ipv6-nd packets are received at rate higher than 200pps,hence are discarded on queue 5!

 

I also, see a ton of STP topology changes. Would it be possible to do a packet capture from the switch displaying the high cpu?

 

Before doing this could you make sure the PC and the switch date and time match. This will make it easier to look at packet capture at the time these logs display.

 

Please let me know if you have any quesitons or concerns.

sitolino
Paper Tape
Posts: 8
Registered: ‎05-15-2019
Location: BR
Views: 227
Message 5 of 16

Re: Lenovo RackSwitch G8272

 
Please send the necessary procedure for the capture of packages.
Lenovo Employee JVOSS2
Lenovo Employee
Posts: 254
Registered: ‎07-17-2018
Location: US
Views: 218
Message 6 of 16

Re: Lenovo RackSwitch G8272

Nothing special from the switch just a wireshark capture from the PC while it is physically connected to the switch. Install wireshark and start the capture for about 3 minutes.

 

Also, would it be possible to check other switches in the network to see if you are receiving the same logs. This is assuming there are other Lenovo switches installed. I believe there is something going on throughout the network and that this is not an isolated incident.

sitolino
Paper Tape
Posts: 8
Registered: ‎05-15-2019
Location: BR
Views: 180
Message 7 of 16

Re: Lenovo RackSwitch G8272

Hello, sorry for the delay.
Attached is the file with the capture of the packages.
The network has several lenovo switches, the PC used to capture the packets is not directly connected to the switch that is in trouble.
Note: The attached file displays an IP scan share that is generated by the OCS inventory software.

Lenovo Employee JVOSS2
Lenovo Employee
Posts: 254
Registered: ‎07-17-2018
Location: US
Views: 167
Message 8 of 16

Re: Lenovo RackSwitch G8272

Thanks for this information.

 

After reviewing the capture I noticed that there are a ton of arp request coming from 10.1.2.3. This equals more than half of the captured packets. Do you know where this IP lives?

sitolino
Paper Tape
Posts: 8
Registered: ‎05-15-2019
Location: BR
Views: 161
Message 9 of 16

Re: Lenovo RackSwitch G8272

This IP has an OCR management software agent running an IP scan to detect new devices on the network. The OCR uses IP 10.1.2.3 and possibly other IPs 10.1.0.0/16.

Lenovo Employee JVOSS2
Lenovo Employee
Posts: 254
Registered: ‎07-17-2018
Location: US
Views: 154
Message 10 of 16

Re: Lenovo RackSwitch G8272

Would it be possible to disable it for a little bit and see if the log/alert goes away? I suspect this might be causing your high CPU message considering ARPs are processed by the CPU.

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