An RSVP PATH message contains a number of objects:
Label Request Object (Mandatory)
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Explicit Route Object (ERO) (optional)
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Record Route Object (RRO) (optional)
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Session Attribute Object (optional)
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The RSVP RESV message is sent back upstream to the ILER following the path created by the PATH message, in reverse order. It contains a number of objects:
Label Object (Mandatory)
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Record Route Object (RRO) (Optional)
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Session Attribute Object (Optional)
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Includes control information Used by the RESV message to follow the same set of hops back to the RSVP originator, reserving resources along the path and confirming the tunnel creation If the node is not ILER, it allocates a new label and places it in the LABEL object sent upstream A node receiving a Label object uses that label for outgoing traffic associated with this LSP tunnel Sent in response to a PATH message including a Label Request Includes control information such as the path setup and hold priorities and local-protection May be used for loop detection Allows the sender and receiver to know the actual route that the LSP tunnel traverses Records hop-by-hop path information Stored in the path state block on each node along the path Can be manually provided or computed based on RSVP requirements such as QoS and policy criteria If ERO is not present then IGP is used to follow the path Sent in the PATH message to specify the path to be followed independent of the IGP shortest path If a node does not supported this object or is incapable of providing a label binding, it sends a PathErr message to the ILER Request intermediate and receiver nodes to provide a label binding for the session
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