A row in this table represents the association
between the PW VC and it's non TE MPLS outer Tunnel
it's physical interface if there is no outer tunnel
(VC only).
An application can use this table to quickly retrieve the
PW carried over specific non-TE MPLS outer tunnel or
physical interface.
The table in indexed by the XC index for MPLS Non-TE
tunnel, or ifIndex of the port in VC only case, the
direction of the VC in the specific entry and the VCIndex.
The same table is used in both inbound and outbound
directions, but in a different row for each direction. If
the inbound association is not known, no rows should exist
for it.
Rows are created by the local agent when all the
association data is available for display.