We have quite a few devices, which have been added into DFM using an interface towards our network (E.g. Fa0/0). In some cases we do not advertise the Network\Subnet configured on other interfaces (E.g. Fa0/1) in our network, so that interface IP is un-reachable from DFM Server.
Even though DFM Server knows that device by it Fa0/0 IP, it still also tries to Poll the Fa0/1 IP and labels the device as un-reachable.
Is there a way to fix this ? Without having to advertise those un-reachable IP Subnets into the network.
This is a known bug, CSCsb48643. The workaround is to unmanage those interfaces in DFM, but then you will also lose operationally down events for them. If you open a TAC services request, and reference this bug, a script can be provided that offers a better workaround. This bug has been fixed in LMS 3.0 by offering a GUI way to disable ICMP probes for certain interfaces.