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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: ATM Wide-Area Networks
>From: Sean Doran <[email protected]> >To: [email protected], [email protected] >Subject: Re: sell shell accounts? >Cc: [email protected] >Date: Wed, 24 Jul 1996 01:43:30 +0100 > >| o Given that each link is rather expensive, it behooves the >| NSP to try to avoid needlessly moving a packet back and >| forth across a DS-3 local loop just because my ATM >| provider can't provide me with any more PVCs. >| (Which was my major point, by the way.) > >Interestingly enough, the NSPs I observe moving large amounts >of traffic around are set up in such a way that their routers >are generally colocated with carrier transmission gear, and >so there *is* no local loop to speak of, as an added cost to >an outside supplier. > [...] Hopefully, my thinking is clearer than my writing... What I originally called "local loop B," now relabeled "This Thing Here," is probably comprised of: o a port on the ATM switch/service o a connection between the router and the switch, (usually a wide-area link, given that most wide-area ATM services backhaul traffic to a few ATM switches) o a port on the router A short-cut VC would avoid needlessly passing packets back and forth across "This Thing Here." That would seem to be a good thing in most circumstances, inasmuch as some or all of the components of "This Thing Here" cost something and may potentially become a bottleneck. -tjs | ________ _______________________ ________ | | Router | loop A | | loop C | Router | | | A |=========| Wide-Area ATM Service |========| C | | |________| |_______________________| |________| | | | | <=== This Thing Here | | | ________ | | Router | | | B | | |________| - - - - - - - - - - - - - - - - -
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