Cisco Technology, Inc.

Eden Tan

Norman William Finn

Michael R Smith

Abilash Menon

Subrat Mohanty

Ganesh Srinivasa Bhat

James Cameron Gibson

Hemant K Hebbar

Manoj T Narayanan

Vinayakumar V Parameswarannair

Manpreet Sing Sandhu

A method for resolving split conditions in a port-extended network comprises receiving first information indicative of a first MAC address of a first controller on a first fabric link and second information indicative of a second MAC address of a second controller on a second fabric link. The method may also include determining that the first MAC address differs from the second MAC address and responsively determining that one of the first MAC address or the second MAC address was previously associated with a primary controller of the port-extended network. One of the first controller or the second controller is designated as the primary controller of the port-extended network based on the determination that one of the first MAC address or the second MAC address was previously associated with the primary controller.

Systems and methods for detecting and resolving split-controller or split-stack conditions in port-extended networks

A system and method detects and responds to failures occurring in a virtual switch. The virtual switch is formed from two or more physical switches interconnected by a Virtual Switch Link (VSL). One physical switch is elected the Master, and it executes a link aggregation protocol for the virtual switch. If the VSL fails, one of the other physical switches assumes that it should become the Master for the virtual switch, and it begins executing the link aggregation protocol. By adding information unique to the physical switches in the control packets of the link aggregation protocol, remote switches can identify when the VSL fails, and report this condition to the original Master. In response, the original Master or the new Master takes corrective action.

System and method for detecting and recovering from virtual switch link failures

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Eden Tan