CBS-350 series unresponsive Web Interface

[PanosT]

Hello everyone,

I have an installation consisting of two CBS-350 switches:

CBS350-24P-4X

CBS350-24T-4G

They both run on firmware 3.4.0.17. They are not stacked and no special configuration has been made.

The problem is that when I access them via a web browser, I get very frequently a notification saying that the page is unresponsive, as indicated in the image attached.

Has anyone had this problem before?

[Flavio Miranda]

@PanosT 

If you keep a ping running, does it drop any packet during this behavior? Any CPU spike?

If connectivity is fine, this is probably a bug. As you are at the latest firmware, I would try to downgrade to 3.3.0.16. Or wait for a new release to come up.

[PanosT]

So I have no loss of packets at all. Trying to see what's the cpu utilization from the web interface wouldn't return anything. So I tried connecting via an ssh terminal and issue the "show cpu utilization" command. The command returned nothing and after a minute the console was getting stuck and I was getting this error 

[Flavio Miranda]

You dont have this on your dashboard?

[PanosT]

Hello Flavio. Sorry about that. I was trying to get this info from Status and Statistics> CPU Utilization.

So looking into this tab the CPU usage is going all the way from 1% to 45-50%. This spikes happen frequently. Is this normal?

[Flavio Miranda]

Up to 50% it is. It would be a problem if the spike gets closer to 100%.

[PanosT]

Ok, so it should be fine. Apart from these my general setup includes a pfsense router that handles 7 VLANs. I need to have a static IP on 3 of them (one for the management, one for Bonjour protocol, and one to act as an IGMP querier). Could the multiple IPv4 interface cause this issue?

[Flavio Miranda]

Dont thing so. Take care with spanning-tree. Make sure this is enabled on the switches.

[PanosT]

It's enabled on both switches with these config

[Flavio Miranda]

If you can, I would downgrade the switch for testing purpose. This could eliminate the possibility of bug on this version.

[PanosT]

Ok yes I can try. The version 3.3.0.16 is stable?

[Flavio Miranda]

It is. As per cisco site.

[PanosT]

It fails to downgrade getting this error messages

%COPY-W-TRAP: The copy operation has failed
%COPY-I-FILECPY: Files Copy - source URL HTTP://<PC_IP>/image_cbs_ros_3.3.0.16_release_cisco_signed.bin destination URL flash://system/images/image_cbs_ros_3.3.0.16_release_cisco_signed.bin