topic RE: SNMP Contact Lost Extreme Control in ExtremeControl

SNMP Contact Lost Extreme Control

Ian_Broadway — Fri, 15 Oct 2021 10:37:00 GMT

Hi All,

We recently installed two new stacks in a location. we're having snmp issues with one of them.

the stack comprises of 4 x x440-g2-48p-10ge4 switches, running code 30.7.2.1

I am able to SSH to the switch but XMC reports it down.

When I review the NAC appliance logs I see these errors;

Have tried restarting the SNMP processes, but no different.

I have reviewed the release notes for the code but no mention of snmp issues and nothing related to a bug in the latest recommended either (30.7.2.1 patch 1-20)

any thoughts would be appreciated

Thanks
Ian

RE: SNMP Contact Lost Extreme Control

OscarK — Fri, 15 Oct 2021 10:42:00 GMT

There is a difference between XMC reporting it down or NAC reporting as lost contact.
If NAC reports lost contact XMC will show the switch with a red symbol even if XMC could contact the switch.
You need to check if the issue is only NAC not being able to contact the switch or if XMC can also not poll it.
Check in NAC engine settings IP resolution if you are not overwriting SNMP settings NAC is using for that switch.

RE: SNMP Contact Lost Extreme Control

Ian_Broadway — Fri, 15 Oct 2021 10:48:00 GMT

Engine Settings > IP Address Resolution > Router IP Discovery?

RE: SNMP Contact Lost Extreme Control

OscarK — Fri, 15 Oct 2021 10:50:00 GMT

Maybe, What I wanted you to investigate was if it was only NAC or NAC and XMC loosing contact.
And then check if they both use the right credentials, either with a capture or another way.

RE: SNMP Contact Lost Extreme Control

Ian_Broadway — Fri, 15 Oct 2021 11:22:00 GMT

that setting is set to use switch credentials.

we also use solarwinds to poll the switches using the same credentials and that's saying the switch is reachable

RE: SNMP Contact Lost Extreme Control

StephanH — Fri, 15 Oct 2021 21:14:00 GMT

Hello Ian,

try an snmpwalk from XMC and NAC directly with your creds to be sure nothing is in between XMC/NAC and the switch. You start snmpwalk on XMC/NAC cli.
Check if you are using the correct profile for you device in XMC. In addition check Alarm&Events->Events on XMC after you did an rediscover vor the mentioned switches.
What can you see in the logs?
In addition check the switch logs (show log) for snmp events after the rediscover.

Regards
Stephan

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Regards
Stephan
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RE: SNMP Contact Lost Extreme Control

Ryan_Yacobucci — Sun, 17 Oct 2021 20:24:00 GMT

Hello,

Usually "No SNMP Authentication Target" is an indication that the switch does not exist in XMC at all.

What happens if you hit the "Clear" button next to the switch?

Thanks
-Ryan

RE: SNMP Contact Lost Extreme Control

Ian_Broadway — Mon, 18 Oct 2021 14:48:00 GMT

Strangely the switch recovered over the weekend, it was extremely slow to access the cli and run commands so I guess system resources were causing the issue