[1516] in Commercialization & Privatization of the Internet
Alternate Routing
daemon@ATHENA.MIT.EDU (yakov@watson.ibm.com)
Mon Oct 21 15:49:28 1991
Date: Mon, 21 Oct 91 15:42:19 EDT
From: yakov@watson.ibm.com
To: steve@ncri.cise.nsf.gov
Cc: com-priv@psi.com
Ref: Your note of Mon, 21 Oct 91 15:28:34 EDT
>I guess ToS can do the same as source-specific routing iff
>the number of ToS bits equals the number of bits needed to
>specify a network.
Not exactly. The problem you are trying to solve is
to discriminate between commercial and non-commercial traffic.
So, you need only 1 bit (which is QUITE less than the number
of bits needed to specify a network). It is important to
realize that while source-specific routing provides
you with a fine grain routing, what you need in practice is a much
coarser grain. While coarser grain may be supported with
a fine grain, the overhead of such a support may be
much higher than if the coarser grain would be supported
directly. The fact that a network X is commercial DOES NOT
imply that X is the ONLY commercial network in the Internet.
There are quite a few of them. Aggregating routing for all
these networks into a single ToS is likely to be more efficient
than making routing for each of these networks individually.
Yakov.
