Add Netgear Switch (SNMPv2) LLDP discovery errors no Graph's

Help
1

Hello LibreNMS Community,

I am a new users of LibreNMS and I have created a test server
to find out of LibreNMS is the right tool in our environment.
So I added about 20 linux desktops, about 20 linux servers,
2 routers, 2 10port managed switches. All by SNMPv2 of v3.

But I also want to add one of the most important switche(s) of
our network. The Netgear GS748TPS. To be more specific: we
have 6 of those switches in a stacked configuration.

When I add this switch (by SNMPv2) I get the following errors:
2017-09-04 14:47:05 System STP added, bridge address: 4c60de5e8cd9
2017-09-04 14:46:26 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:25 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:25 System LLDP discovery of d70 failed - Check name lookup
2017-09-04 14:46:25 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:25 System LLDP discovery of d70 failed - Check name lookup
2017-09-04 14:46:24 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:24 System LLDP discovery of d40-000FD301167B failed - Check name lookup
2017-09-04 14:46:24 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:24 System LLDP discovery of d40-000FD3067563 failed - Check name lookup
2017-09-04 14:46:24 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:24 System LLDP discovery of d70-000FD3059FB9 failed - Check name lookup
2017-09-04 14:46:23 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:23 System LLDP discovery of d40 failed - Check name lookup
2017-09-04 14:46:23 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:23 System LLDP discovery of d40 failed - Check name lookup
2017-09-04 14:46:22 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:22 System LLDP discovery of d40-000FD30122CF failed - Check name lookup
2017-09-04 14:46:21 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:21 System LLDP discovery of d70 failed - Check name lookup
2017-09-04 14:46:21 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:21 System LLDP discovery of d70 failed - Check name lookup
2017-09-04 14:46:21 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:21 System LLDP discovery of d70-000FD305C24B failed - Check name lookup
2017-09-04 14:46:20 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:20 System LLDP discovery of d70-000FD3059FBD failed - Check name lookup
2017-09-04 14:46:20 System LLDP discovery of failed - Check name lookup
2017-09-04 14:46:20 System LLDP discovery of d70 failed - Check name lookup
2017-09-04 14:46:19 System LLDP discovery of d70 failed - Check name lookup
2017-09-04 14:45:44 System sysObjectID -> enterprises.4526.100.10.7
2017-09-04 14:45:44 System sysName ->
2017-09-04 14:45:44 System sysDescr -> GS748TPS
2017-09-04 14:45:44 System Location -> Server Room
2017-09-04 14:45:44 System Hardware -> GS748TPS
2017-09-04 14:45:01 System Device Icon changed => netgear.svg
2017-09-04 14:41:25 System Device type changed => network

But I have no idea what is going wrong or how I could debug this error. Probably I have
not enough experience with SNMP and this advanced (and older model) switch.
Can anyone give me some directions ?

I am now missing all the graphs and traffic information I do have with those two
10port switches…

Kind regards,
Ed

sudo ./validate.php

Component Version
LibreNMS 1.31.03-13-gda0dcda
DB Schema 205
PHP 7.0.22-0ubuntu0.16.04.1
MySQL 10.0.31-MariaDB-0ubuntu0.16.04.2
RRDTool 1.5.5
SNMP NET-SNMP 5.7.3

====================================

[OK] Database connection successful
[OK] Database schema correct
[FAIL] You have a different system timezone (BST) specified to the php configured timezone (UTC), please correct this.

2

can you post a screenshot of what you looking at, please

3

Of course… Here are some screenshots…
The “Ports” overview is completely empty except the “FDB Table”.
This one seems to be correct…
But all the graphs, everywhere, saying: “Error Drawing Graph”.

((( Hmmmm… I can only post one screenshot… )))

Screenshot from 2017-09-04 17-01-53
Screenshot from 2017-09-04 17-01-531920×507 151 KB

4

Screenshot from 2017-09-04 16-58-49
Screenshot from 2017-09-04 16-58-491920×1080 201 KB

Well here is another one… I can post more…
But I do not want to be kicked out of this community!

5

Ok- Looks like you have SNMP configured correctly.

The failed discovery is just part of the auto discovery.
If you don’t have dns host records setup you can tell libre NMS to use ip look up. put this in your config.php $config[‘discovery_by_ip’] = true;

the docs are your best friend: https://docs.librenms.org/ :slight_smile:

As far the Netgear it could be the cause of limited support.
try ./poller.php -h localhost -m ports -d
and the use pastebin to post the output

6

I have go home, for now, so I will post tomorrow (or maybe) this evening to pastebin.
But is the localhost you want ? Or do I have to put in the netgear IP ? (if this is even possible)

And I will read in about the $config[‘discovery_by_ip’] = true;

7

sorry, i meant the Netgear, not local host.

8

https://pastebin.com/CKidKZrc

And now I really have to go :wink:
But I hope you can give me some more information and I will reply!

Good evening! (I guess)
Ed

9

All of those messages are from the auto discovery process, if you don’t have LLDP running correctly then disable. If you do use it then you may need some extra config, DNS being the first one as things like d70 can’t be looked up. Check the docs on auto discovery.

10

Hello Iaf,

I realize indeed that the LLDP errors are not related with the real problem I have.
While I have connected my stacked-switch successfully with LibreNMS, I do not
receive the data and the graphs I was hoping for… (see my screenshots)

11

The time zone was corrected? Seems important for RRD, no?

12

Both, the time zone error (set to UTC) and the LLDP errors are solved.

Only I still do not know what to do with out switch. It is one of the important
pieces in our network we have to monitor. All the other machines work perfect…

Any ideas how I can debug this ?
Or which part of the LibreNMS documentation I have to dive into ?

13

With a lot of debugging I now think the problem is in the Netgear switch itself.
The commands like ‘snmpbulkwalk’ give a lot of timeouts.

So I will investigate this and close this thread.

Thx

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