[6149] in North American Network Operators' Group
Re: Why doesn't BGP... -Reply
daemon@ATHENA.MIT.EDU (Alex.Bligh)
Sun Nov 17 07:14:55 1996
To: Vadim Antonov <avg@pluris.com>
cc: amb@xara.net, ljp@ans.net, nanog@merit.edu
In-reply-to: Your message of "Sun, 17 Nov 1996 00:56:29 PST."
<199611170856.AAA01443@quest.pluris.com>
Date: Sun, 17 Nov 1996 12:05:29 +0000
From: "Alex.Bligh" <amb@xara.net>
> Larry J. Plato <ljp@ans.net> wrote:
>
> >Connectionless and Connection oriented both refer to packet switched
> >technologies, whereas the phone company uses circuit switched technology.
...
>
> This is a terminological question. Here the talk was about connectionless
> and connection-oriented _network_ layer; not the transport layer.
>
> The connection-oriented packet routing network is a generalized case
> of circuit switching -- you can multiplex connections differently.
>
> The fundamental difference between connectionless and connection-oriented
> networks is the amount of state necessarily kept by gateways in order
...
> >SS7 (Signalling System 7) is a connectionless packet switched technology
> >used to control the setup and teardown of circuit switched calls.
> >Originally is was used as a database query technology to make 800
> >numbers portable across carriers. If this did not make sense I can descibe
> >it in a little mnore detail offline.
>
Vadim makes my point better than I did - SS7 etc. make their routing
decision OTO once per call (on call setup). IP makes it once per packet.
Therefore you can put a lot more effort into finding the correct route
if you only have to perform the calculation once. This was an algorthmic
point not a network/transport layer point.
Alex Bligh
Xara Networks
