nanog mailing list archives
Re: the Internet Backbone
From: avg () postman ncube com (Vadim Antonov)
Date: Fri, 5 Apr 1996 15:34:03 +0800
Paul A Vixie <paul () vix com> wrote:
Last time this term came up, I opined that there was no "backbone" any more and that 1996's Internet had a "hairball topology." Vadim, among others, disagreed with me but we didn't pursue the topic. Perhaps we should have.
Well, "backbone" is too vague. I rather prefer to think of Internet topology as of "tiers". The nodes in upper-levels cast "cones of influence" in lower tiers. Nodes from lower tiers belonging to different cones of influence do not generally speak to each other, and so have to purchase transit from higher tiers. Note that this loose definition provides different idea of "backbone" aka the first tier, quite unlike the "defaultless core". To illustrate it let's assume there are two regional dual-homed ISPs, A and B, connected to, say ANS and MCI: ANS- --MCI | X | A--- ---B Both A and B generally have to be defaultless. But they are not in the first tier, but rather in second tier, as they have to purchase transit from first-tier providers to talk to each other. May be we should classify ISPs by miles*bandwidth of their internode circuits?
And in that sense, there is no backbone in 1996.
Tier one is the "backbone". Those are providers not purchasing transit from anybody else.
Terminologically speaking, there's no discrete set of wires or routers or companies you can point to and say, "there, that right there, that is the Internet Backbone."
Well, you can do that in practice, and be pretty certain.
We tend to reserve the term "NSP" for folks who peer at enough NAPs that they have no default route and aren't buying transit from anybody.
Ok, so here we agree :)
We tend to use the term "ISP" when we mean someone in the packet or even the session business who _does_ have to buy transit from somebody. Once in a while I hear the term "backbone provider" used synonomously with "NSP" (as defined above).
That's pretty common usage. Sounds much better than an-as-pee. The term for second-tier is "regional provider" and third tier is usually local providers.
I am not even going to get started (here and now, at least) on the subject of peering politics/economics. I just thought I'd chime in on the definitions of the words we're all using.
--vadim
Current thread:
- Re: the Internet Backbone, (continued)
- Re: the Internet Backbone Paul A Vixie (Apr 05)
- Re: the Internet Backbone Christian Nielsen (Apr 05)
- Re: the Internet Backbone Dave Siegel (Apr 06)
- Re: the Internet Backbone @NANOG-LIST (Apr 06)
- Re: the Internet Backbone Paul A Vixie (Apr 05)
- Re: the Internet Backbone Michael Dillon (Apr 05)
- Re: the Internet Backbone Avi Freedman (Apr 05)
- Re: the Internet Backbone Michael Dillon (Apr 05)
- Re: the Internet Backbone Avi Freedman (Apr 06)
- Re: the Internet Backbone Curtis Villamizar (Apr 08)
- Re: the Internet Backbone David Miller (Apr 06)
- Re: the Internet Backbone Michael Dillon (Apr 06)