SNMP discovery does not find any devices

Problem

You launched an SNMP discovery run but didn't find any devices.

Solutions

The SNMP discovery process will run against every IP address in your list from the cidr section in the discovery configuration. During the scan, there is a TCP port check to ensure the target IP address is responsive. If successful, ktranslate will then attempt to communicate with the IP address via SNMP.

Common failure points in the discovery process include:

• timeouts due to either network latency or device response times to SNMP requests. Meraki Cloud Controllers recommend at least a 10s timeout value, for instance.
• initial failures on the responsiveness check from devices that are generally under tighter security postures, like firewalls.

To work around these problems, try one or both of the following solutions:

1. Edit the snmp-base.yaml and increase the timeout value for the timeout_ms variable.
2. For devices that still seem unresponsive, set all the cidrs values to a length of /32, which forces the discovery process to skip the responsiveness check and only attempts the SNMP connection.