DCB-based path selection systems and methods for san traffic in lag topologies

A Data Center Bridge (DCB)-based path selection device for reducing packet loss in a network system comprising a Link Aggregation Group (LAG) topology that utilizes an inter-node link (INL), the DCB-based path selection device comprising:

• an INL interface that communicatively couples the DCB-based path selection device to a LAG peer node via an INL, the LAG peer forwards, in response to having no DCB-enabled links to a downstream device, traffic on the INL to the DCB-based path selection device;
• and
• a non-transitory computer-readable medium or media comprising one or more sequences of instructions which, when executed by at least one processor, causes, responsive to DCB-based path selection device receiving DCB traffic on the INL, steps to be performed comprising:
• indicating that the DCB traffic be forwarded on a LAG sub-trunk that comprises one or more DCB-enabled links;
• overriding an egress mask that indicates to not forward traffic received at the LAG peer node on the INL;
• and
• forwarding the DCB traffic received on the INL.

A non-transitory computer-readable medium or media comprising one or more sequences of instructions which, when executed by at least one processor, causes steps to be performed comprising:

• receiving traffic at a LAG node associated with a LAG trunk that comprises:
• a set of links whose physical status is up;
• and
• a LAG sub-trunk that comprises a sub-set of links whose physical and DCB status are up;
• responsive to identifying DCB traffic in the traffic, forwarding the DCB traffic using at least one or more links of the LAG sub-trunk;
• and
• responsive to identifying non-DCB traffic in the traffic, irrespective of DCB status of the set of links, forwarding the non-DCB traffic using at least one or more links of the LAG trunk.