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Today's Topics:
1. please take me off of this list. Thanks (Victor Lora)
2. Re: [External] Using two or more snmp communities for the
same node? (Christian Ramseyer)
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--- Begin Message ---
Good news, I've now noticed that the EOS Collector that @robertlynch3
submitted a while ago already has VRF support for subnets + arp tables:
https://github.com/netdisco/netdisco/blame/master/lib/App/Netdisco/SSHCollector/Platform/EOS.pm
So I'd just try using that.
But before I noticed this I had Codex draft a quick combined patch for
snmp-info + Netdisco, it could serve as an outline if anybody is really
serious about this:
https://gist.github.com/rc9000/0b07e2a240b62e3445ad353eb2431535
(completely untested, 100% AI, I haven't touched an Arista device in my
life, but looks good to me as a first step)
Cheers
Christian
On 25.08.2026 17:38, Beals, Damon G 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]>; netdisco-
[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 <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]>
*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
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--
Christian Ramseyer, netnea ag
Network Management. Security. OpenSource.
https://www.netnea.com
Phone: +41 79 644 77 64
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