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DOMAIN.RLI
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[42293] PY
Path: W3IWI!N6VV!W0RLI
Date: 16 Jul 88 22:22:14 Z
From: W0RLI@W0RLI
To: W3IWI
Subject: For your review.
Initial specification for Hierarchical Routing Designators.
A system that supports hierarchical routing will identify
itself with the "H" feature letter.
A hierarchical routing designator is composed of any number
of fields delimited by dot ("."). The fields are in the order
more to less specific from left to right (see examples below).
A hierarchical routing designator may contain up to 31 charactors,
including the dot delimiters. There is no explicit limit on
the number of fields.
Examples:
w0rli.norcal.usa
ja2xxx.32.j2net.jpn.asia
amsat
md.usa
95060.ca.usa
How will compatiblity with existing systems work?
When a system that handles hierarchical designators receives
a message from a system that does handle them there is no problem.
Things work as they always have.
When a system that handles hierarchical designators sends
a message to a system that does not handle them, it sends
the leftmost field of the designator as the "@ BBS" field.
How will forwarding work?
For each message, each field of the hierarchical designator becomes
a candidate key for routing the message. They leftmost field of
the hierarchical designator that matches an entry in any routing
list is used to forward the message. For example:
ja2xxx.32.j2net.jpn.asia
If ja2xxx is in my route list, I route to him directly.
If 32 is in my route list, I use that route.
If j2net is in my route list, then I use it.
If jpn is in my route list, then I use it.
If asia is in my route list, then I use it.
Stations outside asia would all have asia in their route list,
routing their traffic to some nearby HF gateway which can route
to asia. The HF station that routes to Japan would route using
the jpn part of the designator. Inside Japan, the gateway station
would route toward the JA2 districts using the j2net part of
the designator. Inside JA2, stations would route toward the
correct region using the 32 part of the designator. Inside
the 32 region, stations would route directly to ja2xxx using
the first part of the designator.
One useful way to think about hierarchical designators is to
think of the "." as meaning "is within" . Thus the designator
w0rli.norcal.usa means "w0rli, who is in norcal, which is in usa.