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Today's Topics:
1. Re: [External] Using two or more snmp communities for the
same node? (Eric Miller)
--- Begin Message ---
Thanks for the report. You are right that nothing was dumped. The "Dumped config" line made it look like the job had worked, when in fact it printed nothing at all. This is fixed and will be in the next release. Versions 2.104000 through 2.105003 are affected. Until then you can still dump a single setting, which was never
broken: ~/bin/netdisco-do dumpconfig -p workers That takes one top-level setting name. On Aug 25, 2026, at 4:49 PM, "Beals, Damon G via netdisco-users" <[email protected]> wrote: 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] > 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] > Sent: Friday, August 21, 2026 19:02 To: Beals, Damon G < [email protected] >; [email protected] < [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
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
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
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] > > *Sent:* Tuesday, August 18, 2026 13:48 > *To:* [email protected] <netdisco- e > [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 > [email protected] >
https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsourceforge.net%2Fp%2Fnetdisco%2Fmailman%2Fnetdisco-users%2F&data=05%7C02%7Cdbeals%40iu.edu%7C58b776e3d2c34c28748208deffd83f53%7C1113be34aed14d00ab4bcdd02510be91%7C1%7C0%7C639229501421228299%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Ed2laTG%2FGykuO9rJvY%2BOpKCbB3%2BilSBiWGgXsHX1ZWY%3D&reserved=0
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