Only Card, Interface and Port discovered for sysOID - .1.3.6.1.4.1.1916.2.520:

Products

• VMware Smart Assurance
• Network Observability

Issue/Introduction

• After applying certification for Extreme Switch 5520-24X-ACDC (sysOID .1.3.6.1.4.1.1916.2.520), only Card, Interface, and Port objects are discovered.
• Environmental and Host Resource components such as Fan, Memory, PowerSupply, Processor, and TemperatureSensor are missing from the topology.
• Discovery logs may show timeouts during the Performance-Probe phase.

Environment

All supported Smart releases

Cause

The issue is typically caused by the device's SNMP agent failing to handle simultaneous probe requests or responding too slowly during the discovery process.

1. SNMP Timeouts: In impacted environments, getnext or getbulk requests (e.g., for extremePowerStatus .1.3.6.1.4.1.1916.1.1.1.21) may take significantly longer than the configured Smarts timeout (e.g., 2+ minutes).
2. Concurrency Issues: The device SNMP agent may struggle to process multiple simultaneous SNMP probe requests, leading to dropped packets or failed responses.

Resolution

1. Validate Certification: Ensure the device is certified using the correct templates. For sysOID .1.3.6.1.4.1.1916.2.520, the following instrumentation should be defined:
   • Environment = ExtremeAlpine:DeviceID
   • CPU/Memory = Extreme:DeviceID
2. Increase SNMP Timeout: Temporarily increase the defaultTimeout and defaultRetries in Smarts to accommodate the slow response from the device.
   • Refer to Article 331659 for recommended settings.
3. Disable SNMP Bulk: If the device agent fails specifically on bulk requests, disable snmpbulkget for this sysOID.
   • Refer to Article 399364 for steps to disable getBulk.
4. Vendor Engagement: If the above steps do not resolve the issue, contact the device vendor (Extreme Networks) to investigate the SNMP agent's performance and its ability to handle concurrent requests during polling.