| 摘要 |
Link delay is determined in a network comprising a plurality of nodes by identifying pairs of nodes associated with a given link, and, for each of the identified pairs, setting up a virtually-concatenated group (VCG) between the nodes of that pair. The VCGs are utilized to make delay measurements, and the delay measurements are processed to determine delay of the given link. In an illustrative embodiment, the VCGs comprise two-member VCGs with the members being routed on opposite sides of a logical ring. For a given one of these two-member VCGs, a differential delay measurement is made at a particular one of the associated nodes by comparing frame indicator fields for concurrently arriving frames. A system of equations is generated based on the differential delay measurements made utilizing the VCGs, and the system of equations is solved to obtain information utilizable to determine delay of the given link.
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