I am having strange issues with one specific VLAN in a Hyper-V 2012 cluster.
The cluster has 3 servers, each one has a "Management" adapter and virtual switch for management traffic and "VM Data" adapter and virtual switch for virtual machine traffic. Host access is enabled for the "Management" virtual switch and disabled for the "VM Data" virtual switch. 5 VLANs are enabled for the "VM Data" adapters with IDs 1,2,3,5 and 7. A virtual machine with the virtual network adapter set to untagged or VLAN IDs 1,2,5 or 7 will work just fine, but there's no network access with VLAN ID 3. I triple-checked everything from switch config, host adapter config, virtual switches and the corresponding enabled VLANs, VM networks and logical networks... no luck. This issue happens on all 3 servers of the cluster.
Server 1+2: HP ProLiant DL380 G7 with HP (rebranded Broadcom) NICs
Server 3: Dell PowerEdge 2950 III with Broadcom NetExtreme II NICs
If i directly connect a PC to the switch ports, communicating with VLAN 3 works without a problem.
When enabling host access for the "VM Data" virtual switch with VLAN 3, the host also cannot communicate through the vEthernet adapter. Two virtual machines with VLAN ID 3 on the smae host can communicate with each other.
Assistance would be much appreciated, i ran out of ideas.
Best regards,
BS