router
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... addressing constraints described in this document are largely the
result of the interaction of existing router technology, address
assignment, and architectural history. After extensive review and
discussion ...
... currently deployable technologies available to overcome these
limitations. In the event that routing or router technology develops
to the point that adequate routing aggregation ...
... routing aggregation can be achieved by
other means or that routers can deal with larger routing and more
dynamic tables, it may be appropriate to review these constraints ...