Hi there and thank you for your KB-Post.
When exactly do you get the "no interface found" error/message? What sensor are you attempting to add?
Did you have a look at this post/script?
If your device implements the bgpPeerTable from the RFC1269-MIB or BGP4-MIB, the sensor should work. An SNMP Custom Table sensor on the 1.3.6.1.2.1.15.3 OID should also work.
To confirm whenever this data is available, you can perform a walk test from the SNMP Tester on the 1.3.6.1.2.1.15.3 OID.
I'm not sure whenever the VRF will play a role. You may need to use the correct SNMP Credentials (Community for SNMP V1 and V2c or "Context" for SNMP V3) to poll a specific instance/VRF. If unsure please check with the device's vendor.
Best Regards,
Luciano Lingnau [Paessler Support]
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