There is a difference between allowing protocol to be used in a "local" only mode (single label) and a "global" mode (multi-label) and saying you must support single label in a global context.
If a protocol is used in a global mode, the problem with trying to use it in a tailored, local mode is that the various defaults of the local context are not carried with the data that escapes into the global context.
There must be perfect gatewaying between the two contexts and this almost never achieved.
d/ -- Dave Crocker Brandenburg InternetWorking bbiw.net _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf