It sounds like you have NPM + an additional poller. Is that correct? If so have you installed IPSLA on both the main and additional poller? Also, what operation(s) are running on the routers?
it is an additional poller (i have 6 of them)
Initially i did not have the ipsla module installed onto the poller, but i soon realised that when discovering operations, it used to crash.
However, now i have around 450 nodes added to this poller, and i have IPSLA probes deployed to 7 of them
I have added all 7 of these to IPSLA
5 of the nodes have discovered the probes, and aree happil;y collecting DATA
2 of the nodes, same model, do not discover the probes, even though Fluke ResponseWatch does discover them