After the deployment and configuration of Dell EMC Solution for Microsoft Azure Stack HCI, you may see that the DCBX operational state on the network switches may be shown as down.This can be verified by running
show interfaces tengigabitethernet x/y pfc detail. TOR1#show interfaces tengigabitethernet 1/5 pfc detail Interface TenGigabitEthernet 1/5 Admin mode is on Admin is enabled, Priority list is 3 Remote is disabled Local is enabled, Priority list is 3 Oper status is init PFC DCBX Oper status is Down Reason: Waiting for Peer State Machine Type is Symmetric TLV Tx Status is enabled PFC Link Delay 65535 pause quntams Application Priority TLV Parameters : -------------------------------------- FCOE TLV Tx Status is enabled ISCSI TLV Tx Status is disabled Local FCOE PriorityMap is 0x8 Local ISCSI PriorityMap is 0x0 1581 Input TLV pkts, 8649 Output TLV pkts, 121 Error pkts, 4495543 Pause Tx pkts, 374345 Pause Rx pkts 0 Input Appln Priority TLV pkts, 0 Output Appln Priority TLV pkts, 0 Error Appln Priority TLV Pkts
As a part of the deployment guidance for Dell EMC Storage Spaces Direct Ready Nodes, for infrastructures that use RoCE v2 for RDMA using Mellanox CX4 LX adapters, we recommend disabling DCBX willing globally in the host OS and setting network adapter DCBXMode to Host in charge. With this configuration, there is no down stream entity that is exchanging the DCBX information with the Dell EMC networking switch and therefore the DCBX operational status will be shown as down on the server facing ports.