Patent ID: 8260960

Claim:
A computer program product for communicating with a switch and destination node, the computer program product comprising a computer readable storage device having computer readable program code embodied therein that executes to perform operations, the operations comprising: initiating a login with the switch including a test service parameter requesting a non-delivery notification service to cause the switch to return a non-delivery notification in response to a test path request indicating the destination node that is unavailable; indicating that the test service is available for the login in response to receiving a reply from the switch that the switch accepts the login with the non-delivery notification service; receiving a state change notification with respect to the destination node; sending the test path request to the destination node via the switch to determine whether the destination node is available in response to receiving the state change notification and in response to determining that the non-delivery notification service is available for the switch login; and receiving the non-delivery notification from the switch in response to the switch determining that the destination node to which the test path request is directed is unavailable.