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Identifying the Problem Link

Each PathErr message includes the sender’s IP address. This information is propagated unchanged toward the ingress router. A lookup in the TED can identify the node that originated the PathErr message.

Each PathErr message carries enough information to identify the RSVP session that triggered the message. If this is a transit router, it simply forwards the message. If this router is the ingress router (for this RSVP session), it has the complete list of all nodes and links the session should traverse. Coupled with the originating node information, the link can be uniquely identified.

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