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Today's Topics:
1. Re: [External] Using two or more snmp communities for the
same node? (Beals, Damon G)
2. Re: [External] Using two or more snmp communities for the
same node? (Christian Ramseyer)
--- Begin Message ---
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 <[email protected]>
Sent: Tuesday, August 18, 2026 13:48
To: [email protected] <[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
--- End Message ---
--- Begin Message ---
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://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://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://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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--- End Message ---
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