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Scenario 2a: Single LSP Modification Uses only Virtual concatenation Only applicable when requested by the ingress node New (complete) “traffic parameters” sent downstream within Path/Label Request message (w/ modified LSP ID) from ingress to egress At egress, if accepted: traffic parameters sent back (Resv FLOWSPEC), if not acceptable: previous traffic parameters sent back indicating refusal Decreasing #VC can only be performed from the end (stack) MT field not used for #VC increase (or decrease)