System and method for supporting inter-subnet control plane protocol for ensuring consistent path records in a high performance computing environment

A method for supporting consistent path records in a high performance computing environment, comprising:

• providing, at one or more computers, including one or more microprocessors, a first subnet, the first subnet comprising
• a plurality of switches, the plurality of switches comprising at least a leaf switch, wherein each of the plurality of switches comprise a plurality of switch ports,
• a plurality of end nodes, wherein the plurality of end nodes are interconnected via the plurality of switches,
• a subnet manager, the subnet manager running on one of the plurality of switches and the plurality of end nodes, and
• an inter-subnet manager (ISM), the inter-subnet manager running on one of the plurality of switches and the plurality of end nodes;
• configuring a switch port of the plurality of switch ports as a router port;
• interconnecting the first subnet with a second subnet via the switch port configured as a router port;
• assigning an one end node of the plurality of end nodes to an inter-subnet partition (ISP) of a plurality of inter-subnet partitions;
• calculating, by the subnet manager, a first local path record between the switch port configured as a router port and the an one end node of the plurality of end nodes assigned to the ISP, wherein the local path record comprises at least one limitation;
• communicating, by the ISM, with the second subnet the first local path record;
• and
• communicating, by the ISM, with the second subnet the at least one limitation.

A non-transitory computer readable storage medium, including instructions stored thereon for supporting consistent path records in a high performance computing environment, which when read and executed by one or more computers cause the one or more computers to perform steps comprising:

• providing, at one or more computers, including one or more microprocessors, a first subnet, the first subnet comprising
• a plurality of switches, the plurality of switches comprising at least a leaf switch, wherein each of the plurality of switches comprise a plurality of switch ports,
• a plurality of end nodes, wherein the plurality of end nodes are interconnected via the plurality of switches,
• a subnet manager, the subnet manager running on one of the plurality of switches and the plurality of end nodes, and
• an inter-subnet manager (ISM), the inter-subnet manager running on one of the plurality of switches and the plurality of end nodes;
• configuring a switch port of the plurality of switch ports as a router port;
• interconnecting the first subnet with a second subnet via the switch port configured as a router port;
• assigning an one end node of the plurality of end nodes to an inter-subnet partition (ISP) of a plurality of inter-subnet partitions;
• calculating, by the subnet manager, a first local path record between the switch port configured as a router port and the an one end node of the plurality of end nodes assigned to the ISP, wherein the local path record comprises at least one limitation;
• communicating, by the ISM, with the second subnet the first local path record;
• and
• communicating, by the ISM, with the second subnet the at least one limitation.