A row in this table configures the outer tunnel used for carrying the PW traffic toward the PSN. In the case of PW labels only, it configures the interface that will carry the PW traffic. An entry in this table augments the pwMplsEntry, and is created automatically when the corresponding row has been created by the agent in the pwMplsEntry. This table points to the appropriate MPLS MIB module. In the MPLS-TE case, the three variables relevant to the indexing of a TE tunnel head-end (as used in the MPLS-TE-STD-MIB) are to be configured, and the tunnel instance indicates the LSP that is currently in use for forwarding the traffic. In case of signaled Non-TE MPLS (an outer tunnel label assigned by LDP) the table points to the XC entry in the LSR-STD-MIB. If the Non-TE MPLS tunnel is manually configured, the operator configures the XC pointer to this tunnel. In case of PW label only (no outer tunnel) the ifIndex of the port to carry the PW is configured here. It is possible to associate a PW to one TE tunnel head-end and a non-TE tunnel together. An indication in this table will report the currently active one. In addition, in the TE case the table reports the active tunnel instance (i.e. the specific LSP in use). Any read-write object in this table MAY be changed at any time, however change of some objects (for example MPLS-TE indexes) during PW forwarding state MAY cause traffic disruption.