Method and apparatus for testing links between network switches

Details Method and apparatus for testing links between network switches Method and apparatus for testing links between network switches

1996-11-15

1998-01-27

Beausoliel, Jr., Robert W.

Excavating

371 682, 3951832, 3642651, 3649445, G01R 3128, G06F 1100

Patent

active

057128561

ABSTRACT:
A test link protocol which continuously monitors each link in a network to ensure that the link is correctly transmitting data. Each switch, or torus has at least one of two functional components: Send Test and Receive Test. The Send Test component monitors control codes at a torus link output. The Receive Test component monitors control codes at a torus link input. After a predetermined interval, the Send Test component makes a request to send a test.sub.-- link control code. The torus sends the test.sub.-- link code to the neighboring torus, where it is removed from the data stream and sent to that torus' Receive Test. The Receive Test then generates a response message and makes a request to send that message back to the originating torus. After receiving the message, the Send Test analyzes the message to determine whether the network link is working correctly. An error is also declared if the Send Test does not receive a reply within a predetermined interval.

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