| 摘要 |
Verification of the connectivity of a logical link can be accomplished even in a network including a plurality of nodes that are connected through data link(s) and a control channel between adjacent nodes. A node that is the start point of a logical link to be verified transmits a logical link verification request message, over a control channel, to a node that is the end point of the logical link to be verified, thereby notifying that a connectivity verification test will begin. Thereafter, the start-point node transmits a physical link verification message (verification data) over the logical link to be verified. When notified through the control channel that the test will begin, the end-point node carries out the connectivity verification test, based on whether or not it can receive the verification data through the logical link to be verified. The end-point node returns a test result message to the start-point node.
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