| 摘要 |
A method for testing connectivity of a multi-segment pseudo-wire ("MS-PW") in a network, the method comprising: sending an echo request message from a first provider edge ("PE") device to a second provider edge ("PE") device for a section of the multi-segment pseudo-wire ("MS-PW") between the first provider edge ("PE") device and the second provider edge ("PE") device; the echo request message being identified as such by a control word contained therein; an inner label of the echo request message having a time-to-live ("TTL") value set to a number of segments in the section; the time-to-live ("TTL") value for determining whether the control word is to be inspected as it traverses the section; upon the echo request message arriving at the second provider edge ("PE") device, the second provider edge ("PE") device recognizing the echo request message as such by inspecting the control word contained therein; and, receiving an echo reply message from the second provider edge ("PE") device in response to the echo request message, the echo reply message confirming connectivity of the section.
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