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Today's Topics:
1. Re: [External] Using two or more snmp communities for the
same node? (Beals, Damon G)
--- Begin Message ---
Yeah I just tried to limit the Arista to using community@VRF and looks like
discovery tries to do a .1.3.6.1.2.1.1.3.0 which is sysuptime, and of course
that fails in the VRF but works in main. I will mess with SnmpV3 and see if
that might work any better.
I think I found a bug in the latest version 2.105.3, if it do a netdisco-do
dumpconfig if dies with a undef..
~/bin/netdisco-do dumpconfig
[345380] 2026-08-25 18:02:59 info App::Netdisco version 2.105003 loaded.
[345380] 2026-08-25 18:02:59 info dumpconfig: started at Tue Aug 25 14:02:59
2026
undef
[345380] 2026-08-25 18:02:59 info dumpconfig: finished at Tue Aug 25 14:02:59
2026
[345380] 2026-08-25 18:02:59 info dumpconfig: status done: Dumped config
Damon Beals
Network Architect
Indiana University
317.274.7946
________________________________
From: Michael Butash <[email protected]>
Sent: Tuesday, August 25, 2026 12:14
To: [email protected] <[email protected]>
Subject: Re: [Netdisco] [External] Using two or more snmp communities for the
same node?
VRF's have been an issue for any snmp management open or commercial since
people started using them in the early 2000's with MPLS, later with firewall
vendor contexts, and mostly screws over management tools where ever this is
used. Most NMS's doing discovery don't expect to hit a single node pretending
to be multiple nodes, almost universally they crap the bed when you try, and
mostly the same situation here. Your best bet is to treat them as separate,
different devices, but if I remember Netdisco will typically see enough by
serial number and such to attribute them as the same device, and still try to
lump them together incorrectly.
Netdisco just requires some fundamental changes to allow multiple of the same
devices as separate instances, and I'm not at all sure how hard that would be.
I'd say ask an LLM and see these days if something that can be cleanly done.
-mb
On Tue, Aug 25, 2026 at 8:55 AM Beals, Damon G via netdisco-users
<[email protected]<mailto:[email protected]>>
wrote:
Thanks for the response, I didn't realize this was an issue, I thought it was
just a config issue.
I think I will try to modify the config so that only the Arista switches will
use community@VRF, and the other devices will use community. Right now we only
have one VRF to deal with, but we do plan on doing more.
Damon Beals
Network Architect
Indiana University
317.274.7946
________________________________
From: Christian Ramseyer <[email protected]<mailto:[email protected]>>
Sent: Friday, August 21, 2026 19:02
To: Beals, Damon G <[email protected]<mailto:[email protected]>>;
[email protected]<mailto:[email protected]>
<[email protected]<mailto:[email protected]>>
Subject: Re: [Netdisco] [External] Using two or more snmp communities for the
same node?
Hi Damon
The mailing list is still in use but it's not so frequented anymore, so
for visibility github might be a bit better.
Anyways I'm afraid for Arista there is currently no support to use SNMP
this way. Cisco has a similar feature where a vlan can be appended and
Netdisco is using these through special hints in the respective
snmp-info modules, look for cisco_comm_indexing/snmp_comm_reindex to
find out more.
There's also an snmp v3 variant, where the better formalized snmp v3
context can be used in a similar way, even for VRFs
https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnetdisco%2Fnetdisco%2Fwiki%2FVendor-Tips%23vrfs-and-nxos&data=05%7C02%7Cdbeals%40iu.edu%7C58b776e3d2c34c28748208deffd83f53%7C1113be34aed14d00ab4bcdd02510be91%7C1%7C0%7C639229501421158854%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=S63SD8cZWiULsWHQiVY%2B%2Ftpeb5cJQLaGVcaPiwiJvJ8%3D&reserved=0<https://github.com/netdisco/netdisco/wiki/Vendor-Tips#vrfs-and-nxos>
Lastly there is a third way that is used with many vendors, which is not
using snmp but SSH to run specific commands for arp and mac-address
table collection:
https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnetdisco%2Fnetdisco%2Ftree%2Fmaster%2Flib%2FApp%2FNetdisco%2FSSHCollector%2FPlatform&data=05%7C02%7Cdbeals%40iu.edu%7C58b776e3d2c34c28748208deffd83f53%7C1113be34aed14d00ab4bcdd02510be91%7C1%7C0%7C639229501421186948%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=kjqImd0oB6oNgsHBEaY4tE4U6zUSZ464Tv2F1xcqPNk%3D&reserved=0<https://github.com/netdisco/netdisco/tree/master/lib/App/Netdisco/SSHCollector/Platform>
But from quickly looking at all of these things it seems there is
nothing already working for Arista. You'd need to either experiment
yourself or get some motivated colleagues/students/LLMs to do it. If you
get it to work, pull requests for snmp-info or Netdisco are of course
highly appreciated. How to get started with hacking is in
https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnetdisco%2Fnetdisco%2Fwiki%2FDeveloping%23tldr-i-just-want-to-clone-the-repo-and-get-started&data=05%7C02%7Cdbeals%40iu.edu%7C58b776e3d2c34c28748208deffd83f53%7C1113be34aed14d00ab4bcdd02510be91%7C1%7C0%7C639229501421205401%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=kcy49cPzyO%2BgZcebEtH6xHfK%2Bp7JlerreinbgbkKWUw%3D&reserved=0<https://github.com/netdisco/netdisco/wiki/Developing#tldr-i-just-want-to-clone-the-repo-and-get-started>
Cheers
Christian
On 21.08.2026 16:03, Beals, Damon G via netdisco-users wrote:
> Is this email list still active? Or should I just open a ticket on github?
>
> Damon Beals
> Network Architect
> Indiana University
> 317.274.7946
>
> ------------------------------------------------------------------------
> *From:* Beals, Damon G via netdisco-users <netdisco-
> [email protected]<mailto:[email protected]>>
> *Sent:* Tuesday, August 18, 2026 13:48
> *To:*
> [email protected]<mailto:[email protected]>
> <netdisco- e
> [email protected]<mailto:[email protected]>>
> *Subject:* [External] [Netdisco] Using two or more snmp communities for
> the same node?
> This message was sent from a non-IU address. Please exercise caution
> when clicking links or opening attachments from external sources.
>
> So I just discovered our Arista switches can provide information about a
> VRF if you add the VRF to the snmp community. For example
> community@VRF. Doing test via snmpwalks, I do get the information from
> that VRF.
>
> My question is, how do I get netdisco to use both community, and
> community@VRF for the same node, or what if we have 4 or 5 VRF we need
> to collect from? From my test it looks like once netdisco finds a
> working snmp it caches that community and doesn't use others?
>
> >From the docs
> "Each is tried in turn when polling the device, and then the working
> community string will be cached in the database.
>
> Damon Beals
> Network Architect
> Indiana University
> 317.274.7946
>
>
> _______________________________________________
> Netdisco mailing list
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