Hi, anyone how can help to me and validate or recommend a topology to implemente a cluster of CNR for DHCP on failover pair; using a second Nic to that redundancy service?
Topology one:

It's posible implement a failover-pair if de IP address on second NIC (ens224) are unreachable from regional cluster?; I Tried it's but when I created the failover on regional server that is posible only with NIC 1 (ens192); the other option that I tried is create the failover in the local servers using the NIC2 (ens224) and the communication come up on the pairs; but on the two variants exist an inconsistency in the configuration to regional or local server and a issue of the reference IP to failover pair.
Topology two:

To this new topology, always use the failover pair on second NIC (ens224); regional cluster don't have connectivity to Nic 2 (ens224) on local server 1. Local Server have connectivity from both Nic's.
Topology three:

This topology works; but it's recommended?
Topology four:

I understand that this last topology it's a traditional implementation?
Exist an option to implement the failover over a second NIC exclusively or the las two (3rd and 4th) are the best way to implement?
Thank You by your support and comments.