Just a brief historical note to point out that there were other
hierarchical
node things before these, including OSPG and IS-IS; the earliest one
I know of
is a proposed "area" extension to the so-called 'new' ARPANet
routing (I have
a ref if anyone cares). If anyone knows of an earlier one, I'd be
interesting
in hearing of it, so I can add credits for it.
ISO-IGRP happened around/before the time of OSPF. It had a 3 level
hierarchy, the lowest using system-ids, where you could get mobility
like you did using IS-IS for CLNS within an area, the middle hierarchy
which was a 2-byte area-id, explicitly advertised as a DV protocol,
and the final level which was a longest-match prefix level which used
the rest of the high-order bits of the address (the NSAP address).
Authors were Len Bosak, Jim Forester, and Paulina Knibbe.
Dino
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