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tunnel
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... global token is not available (e.g., serial links, tunnel end-points)
or where global tokens ...
... available. This is expected to be the case for serial links and
tunnel end-points, for example. The alternative would have been for
these to be of the form 0200:0:0:1, 0200:0:0:2, etc., instead of the
...
... identifier. The most common of these are serial links and configured
tunnels. Interface identifiers that are unique within a subnet
prefix must be chosen.
...