The IP over ATM Mailing List Archive by date

[Grenville Armitage <gja@thumper.bellcore.com>]

Keith,

Thanks, I had a suspicion you were referring to a TTL based scoping
mechanism. In that case I'm not sure I agree with your conclusion
here..

>>> >>Another reason (applicable to IP multicast) is the use of the "expanding
>>> >>ring search" technique to progressively search a greater and greater
>>> >>set of receivers of a particular multicast group.  LIS's with a large
>>> >>number of hosts defeat this technique, particularly with respect to
>>> >>finding the "closest" receiver.

TTL scoping is used to help applications find the 'closest' application
server in the sense of IP hops, not link layer miles. It doesn't even
provide a guaranteed relationship to geographical distance when used on
LANs(?) To me the size of a LIS is only marginally relevant
if the LIS is so large that the sysadmin decides to place more than
one of whatever entity you're searching for on it (in which case
maybe more than one is within 1 hop of you).

Anyway, its a minor tangent. We now return to the regularly
scheduled mayhem :-)

cheers,
gja