nanog mailing list archives
Re: Internet Backbone Index
From: "Jay R. Ashworth" <jra () scfn thpl lib fl us>
Date: Sun, 13 Jul 1997 19:44:06 -0400
On Sun, Jul 13, 1997 at 03:08:00PM -0800, Randy Bush wrote:
There is one significant difference between routed and switched backbones. The hops on routed backbones can be seen by end users using tools such as traceroute. On switched backbones, the hops are still there, but can not be seen by end users. Hence the marketing perception is different though the results are really the same.
Actually, from the IP packet's standpoint, no, the results aren't necessarily the same. It's unlikely, but possible, that a switched mesh backbone could forward some packets that a routed one couldn't, due to TTL issues. Didn't some older kernels set rediculously low TTLs on IP packets?
The router side could turn the argument. "With a routed backbone, you can actually SEE what is happening to your packets. It is not a hidden unknown, thus prone to failure you can not diagnose. With routers you know it went bad at nqu1. With switches, it just went bad."
It's a problem I'd accept for this amount of debugging flexibility, though. Cheers, -- jra -- Jay R. Ashworth jra () baylink com Member of the Technical Staff Unsolicited Commercial Emailers Sued The Suncoast Freenet "People propose, science studies, technology Tampa Bay, Florida conforms." -- Dr. Don Norman +1 813 790 7592
Current thread:
- Re: Internet Backbone Index, (continued)
- Re: Internet Backbone Index Dorian R. Kim (Jul 13)
- Re: Internet Backbone Index Randy Bush (Jul 13)
- Re: Internet Backbone Index Alex.Bligh (Jul 13)
- Re: Internet Backbone Index Stephen Balbach (Jul 13)
- Re: Internet Backbone Index Dorian R. Kim (Jul 13)
- Re: Internet Backbone Index Stephen Balbach (Jul 13)
- Re: Internet Backbone Index Dorian R. Kim (Jul 13)
- Benefits of switching at L2 Alan Hannan (Jul 13)
- Re: Benefits of switching at L2 Dorian R. Kim (Jul 13)
- Re: Internet Backbone Index Sean M. Doran (Jul 14)
- Message not available
- Re: Internet Backbone Index Jay R. Ashworth (Jul 13)
- Re: Internet Backbone Index Randy Bush (Jul 13)