A Reservation Request would describe a connection path consisting of a series of "hops" of the following form: ( sourceSTPreference, sinkSTPreference ) This form will be used for the SourceSTP, DestSTP, and ERO hops in the path object. And each of those STP references are of the form: ( Topology ID, Port ID ) or ( topology ID, port ID, type-value1, type-value2, .. , type-valueN ) So an example path object for a reservation might be as follows: _wsdl path:_ SourceSTP - ( sourceTopo="urn:ogf:network:nordu.net:2012", sourcePort="CPH-AMS-1-2" ),( sinkTopo="urn:ogf:network:nordu.net:2012", sinkPort="CPH-NYC-0-1" ) ERO1 - ( sourceTopo="urn:ogf:network:netherlight:2012", sourcePort="CHI-AMS-x" ),( sinkTopo="urn:ogf:network:netherlight:2012", sinkPort="CHI-AMS-r" ) ERO2 - ( sourceTopo="urn:ogf:network:starlight:2012", sourcePort="uslhcnet-out"),( sinkTopo="urn:ogf:network:starlight:2012", sinkPort="uslhcnet-in" ) DestSTP - ( sourceTopo="urn:ogf:network:esnet:2012", sourcePort="LBL-1-2-xmit" ),( sinkTopo="urn:ogf:network:esnet:2012", sinkPort="LBL-1-2-recv" ) I suggest an "STP reference" for either the source or sink STP could be: topologyid="urn:ogf:network:uva:2012", port="...:ge-0-1", vlan=(1-100,105-109,1780-1783) . Thus the path object above could be: SourceSTP - ( sourceTopo="urn:ogf:network:nordu.net:2012", sourcePort="CPH-AMS-1-2", vlan=1780-1783 ), ( sinkTopo="urn:ogf:network:nordu.net:2012", sinkPort="CPH-NYC-0-1", vlan=1-100 ) ERO1 - ( sourceTopo="urn:ogf:network:netherlight:2012", sourcePort="CHI-AMS-x" ),( sinkTopo="urn:ogf:network:netherlight:2012", sinkPort="CHI-AMS-r" ) ERO2 - ( sourceTopo="urn:ogf:network:starlight:2012", sourcePort="uslhcnet-out"),( sinkTopo="urn:ogf:network:starlight:2012", sinkPort="uslhcnet-in" ) DestSTP - ( sourceTopo="urn:ogf:network:esnet:2012", sourcePort="LBL-1-2-xmit", vlan=( 1780,1782,1783 ) ), ( sinkTopo="urn:ogf:network:esnet:2012", sinkPort="LBL-1-2-recv", vlan=( 1780,1782,1783 ) ) (Note: I use short names for ports instead of urns just for example convenience...they could be urns also.)