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A couple of times now it's been suggested that Explicit Label Control is a way to
do SPC connections instead of the SPC_Label sub-object. I'm wondering if
people have a different model of SPC connections in mind. The procedures in
RFC 3473 for Explicit Label Control are as follows:
[when a label sub-object is present] If the U-bit of the
subobject being examined is clear (0), then value of the label is
copied into a new Label_Set object. This Label_Set object MUST be
included on the corresponding outgoing Path message.
If the U-bit of the subobject being examined is set (1), then value
of the label is label to be used for upstream traffic associated with
the bidirectional LSP.
Neither of these would seem to help you for SPC, since there is no outgoing PATH
message at the network endpoint, the endpoint call control is handled by
the management system and not using a UNI or overlay interface (at least
as defined in G.8080).
Explicit Label Control seems like it would help you control the label assignment
within the signaled portion of a connection.