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Path-coupled signaling Sending signaling message along the data path same basic idea as RSVP uses for QoS signaling each router on the path receives a request for measuring a specified data flow non-supportive routers just ignore the message Data collection to (a) per-domain databases (b) case-by-case-specified database (c) along data path back to requesting party Domain 1 Domain 2 Domain 3 Domain 4 |