Network Configuration - VLAN
We have upgraded the network switches and the Redundant control network switches remain the old ones.
The redundant client - server network switches are configured as VLAN's with all the 48 ports on the primary switch on VLAN 172.16.4.0 subnet 255.255.252.0 and the secondary switch with port 1-25 on VLAN 18.104.22.168 subnet 255.255.252.0 and the remaining ports are configured on business side of our plant.
Our primary network is working fine, but when the secondary network is enabled then all the primary and secondary network started having problems in random fashion.
RNRP displays all the available networks, but some systems don't ping on the network looks weird. Our plant IT dept needs to check the Secondary network configuration, but RNRP fault tracer returns no error on any secondary network configuration.
Please throw some light on this problem.
Voted best answer
I would suggest you to do th following checks
1)IGMP Snooping must be disabled.
2)If Spanning Tree (STP/RSTP) is enabled, check if it's really needed and if there's any other option available then disable it.
3)If the actual configuration is not a ring the ring redundancy protocol (Spanning Tree or HIPERRING), ring redudancy operation should be disabled to allow regular use of the ports otherwise reserved for the ring.
Divide and conquer; make configuration smaller and eliminate part by part until you find the root cause.
When taken apart, the primary and secondary networks shall work totally independently from each other.
Preferably the primary and secondary networks shall run on complete separated physical hardware and network links to eliminate the risk that something on one network influences the other.
You have not provided any examples of what goes wrong, etc. but from your description it sounds like primary and secondary networks do share some resource that they should not.
If you know how; reviewing the switches forwarding databases (MAC address tables) can sometimes tell if you have made a bad connection (cable swapped by mistake, etc.).