I receive multiple RR Multiple Primary Messages per day from a pair of L3 switches who have a bunch of vlans and corresponding vlan interfaces.
Closer inspection of the RR groups shows that in VRRP 10, which should have network 192.168.10.0 / VLAN 10 only, there are some other vlan interfaces as well, like 192.168.20.0 from VLAN 20 etc.
So from a switch config perspective, everything is fine, but somehow NNM pulls vlan interfaces into a Redundancy Group that is not part of that group. Also strange: From the 20 or so vlan interfaces / vrrp group on the switches, not all of them have this problem. Also, the groups triggering the false alerst don´t show _all_ the other vlan interfaces, but only 10 or so.
So I wonder: What happened ? Is the MIB of the switches or their SNMP implementation buggy ? Does NNM interpret the data in a creative way ? What can be done to manually remove certain vlan interfaces from groups they don´t belong to and keep them monitored only in the group they should be member of ?