VMNIC not recognizing "Discovered Subnets"

[FABIANO ROCHA]

I'm trying to implement a backup network to backup VMs from ESXi Hosts.

What have I done so far...

1. Created a vSwitch for the backup only vmnic;
2. Created a backup portgroup for this vSwitch;
3. Created a vmkernel NIC for this backup portgroup with static IP settings on backup network (no services), so my backup server authenticate on ESXi by the backup network;
4. Now my "Default TCP/IP stack" has a routing table with VM Network and backup network;

I did exactly these steps above on 5 different hosts...

The backup server (physical) has permanet routes for the 2 NICs. The gateway for the backup route is the address of the backup network (ex: 192.168.15.0).

From the backup server I can ping/access the 5 "Management" vmks, but only 4 "Backup" vmks.

On the host I can´t access the backup vmk (let´s call it Host05), the backup vmnic does not list the "Discovered Subnets".

On Host05 i had to add a new network card (BCM 5720 dual) just for backup. The new card appears in the physical NICs list, status "up", ntg3 driver, and displays the CDP information for the physical backup switch (for hosts).

Have already changed switch ports, cable, physical NIC, tried update ntg3 vib without success.

Host05 ESXi is a Custom Dell ESXi 7.0 U3 A23. Others are VMWare ESXi 7.0 U3.

How can i make this backup vmnic to regognize the "Discovered Subnets" on Host05? What am i missing?

Any help would be appreciated!

[NickDaGeekUK]

I did a similar setup but forgot on one host to tick the box to override the default TCP IP stack for the VMKernel. It caused me problems until I realised my mistake. Don't know if that helps you but check the obvious is first is not a bad rule of thumb.