Device connection issue - contact not established - snmp

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I have problem with NMS add/contact device [B5 switch]. The device is configured, pingable, telnet/ssh work ok from netsight appliance. Also snmpwalk with netsight credential from NMS appliance [cli] works as it should work.
[eg. snmpwalk -v3 -l authPriv -a SHA -x AES -u Very_secret_user -A secret_password -X secret_password 10.70.16.12

iso.3.6.1.2.1.1.1.0 = STRING: "Enterasys Networks, Inc. B5G124-24P2 Rev 06.71.03.0025"]

The device on NMS Console is shown with '?' mark. Refreshing, rediscovering, deleting and adding again doesnt solve problem. From NMS console I can run Device manager [work ok], execute MiB's - works ok, but still there is 'contact not established' status.

Any sugestions ?

[ps. this devices was previousely present at NMS [ok] and disconnected for some time]

Supplement: When I manualy run Tools->Discover with device ip address and snmp creds - device was connected ok and now looks ok.
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Tomasz Lubas

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Posted 3 years ago

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Yacobucci, Ryan, Multi-Tier Technical Support Engineer

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Hello,

Can you send a screenshot of the "Access" radial when you click the switch and are looking at the properties tab? From the screenshot it looks like the poll type might not be set to SNMP. 

You can also check to see what is set up for polling if you click the "tools" menu --> Authorization/Device Access --> Profile/Device Mapping. Click the device and you can check the SNMP profile assigned and what the poll type is. 

Thanks
-Ryan
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Tomasz Lubas

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Hi Ryan, thanks for reply. Device was mapped ok, right profile, credentials and so on. Normally if the device is reached and no SNMP connection is established - then in NMS is orange arrow near device. In my case there was '?' as if not accessible at all:)
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Piotr Owczarek

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Maybe the problem is CLI credential on the switch and NMS mismatch?
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Mike D, Alum

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Hello Tomasz,


Assuming creds are a match - as per Piotr's suggestion - next up on my own checklist is protocol analysis.   A switch side network trace while running management tests would go a long way toward ruling out protocol (and yes credentials) problems.

Regards,
Mike
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Yacobucci, Ryan, Multi-Tier Technical Support Engineer

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Hello Tomasz, 

When you initially add a device into NetSight they will show up as a ? until the device is contacted through SNMP. Once contacted NetSight determines what the device type is and gives it the correct icon per the device type. In this case the device type is not known as NetSight was not able to get any information from the device. Are you still having issues with this specific device?

Thanks
-Ryan