Hi Team,
I am trying to monitor a Vsol (Fibersol) GPON OLT (V1600G) in LibreNMS and facing an issue with ONU identification.
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Added device in LibreNMS using SNMP v2c
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Device successfully discovered and polled
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ONU interfaces are visible under ports
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However, ONU MAC address shows as:
00:00:00:00:00:00 -
ONU Serial Number is not visible anywhere in LibreNMS
Issue Details
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ONU interfaces are discovered, example:
GPON01ONU1 TEST-DEVICE-GPON001e166a -
But:
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MAC =
00:00:00:00:00:00 -
No ONU Serial Number via SNMP
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./valiadate output-
| Component | Version |
|---|---|
| LibreNMS | 26.3.1 (2026-03-17T14:55:34+05:30) |
| DB Schema | 2026_03_05_112733_ospfv3_instances_nullable (374) |
| PHP | 8.3.6 |
| Python | 3.12.3 |
| Database | MariaDB 10.11.14-MariaDB-0ubuntu0.24.04.1 |
| RRDTool | 1.7.2 |
| SNMP | 5.9.4.pre2 |
| =========================================== |
[OK] Composer Version: 2.9.5
[OK] Dependencies up-to-date.
[OK] Database Connected
[OK] Database Schema is current
[OK] SQL Server meets minimum requirements
[OK] lower_case_table_names is enabled
[OK] MySQL engine is optimal
[OK] Database and column collations are correct
[OK] Database schema correct
[OK] MySQL and PHP time match
[OK] Active pollers found
[OK] Dispatcher Service is enabled
[OK] Locks are functional
[OK] Python wrapper cron entry is not present
[OK] Redis is unavailable