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Re: remember the "diameter of the internet"?

  • From: Mathew Lodge
  • Date: Tue Jun 18 14:38:05 2002 
At 07:28 PM 6/18/2002 +0100, Stephen J. Wilcox wrote:


Path is one of the last things to be checked

BGP first checks all kinds of network admin defined things such as local
prefs etc which ought to be properly set by the admins to ensure traffic
is going the best way (which should include local interconnects rather
than last resort transits). Then all things being well BGP can make
choices on path!
So, you're advocating that the admin do all of the optimization manually for all destinations by setting preferences?

Mathew





On Tue, 18 Jun 2002, Mathew Lodge wrote:

>
> At 01:33 PM 6/18/2002 -0400, Pawlukiewicz Jane wrote:
> >Are you asking _why_ there are so many hops between yourself and the guy
> >across town?
>
> He's not, but answer is that BGP's key metric is AS path length. This can
> have very little to do with the optimality (expressed as efficient use of
> resources) of the actual packet path.
>
> Cheers,
>
> Mathew
>
>
>
>
> >Jane
> >
> >brett watson wrote:
> > >
> > > i sit behind cox-cable service at home, and in troubleshooting why my
> > > connectivity is *so* horrible, i find the following traceroute. does
> > > anyone do any sane routing anymore? does diameter matter (we used to talk
> > > about it a long, long while ago). i guess i'm just old and crusty but this
> > > seems to violate so many natural laws.
> > >
> > > i find in more random testing that i seem to be a minimum of 15 hops from
> > > anything, and it's not just the # of hops, it's the *paths* i travel.
> > > bouncing between two cities several times, on several different provider
> > > networks, from one border to the other.
> > >
> > > wow.
> > >
> > > -b
> > >
> > > traceroute www.caida.org
> > >
> > > 1 10.113.128.1 30 unavailable
> > > 2 68.2.6.25 10 ip68-2-6-25.ph.ph.cox.net
> > > 3 68.2.0.26 40 ip68-2-0-26.ph.ph.cox.net
> > > 4 68.2.0.18 50 ip68-2-0-18.ph.ph.cox.net
> > > 5 68.2.0.10 20 ip68-2-0-10.ph.ph.cox.net
> > > 6 68.2.0.70 10 ip68-2-0-70.ph.ph.cox.net
> > > 7 68.2.14.13 10 chnddsrc02-gew0303.rd.ph.cox.net
> > > 8 68.1.0.168 20 chndbbrc02-pos0101.rd.ph.cox.net
> > > 9 68.1.0.146 30 dllsbbrc01-pos0102.rd.dl.cox.net
> > > 10 12.119.145.125 40 unavailable
> > > 11 12.123.17.54 30 gbr6-p30.dlstx.ip.att.net
> > > 12 12.122.5.86 51 gbr4-p90.dlstx.ip.att.net
> > > 13 12.122.2.114 80 gbr2-p30.kszmo.ip.att.net
> > > 14 12.122.1.93 50 gbr1-p60.kszmo.ip.att.net
> > > 15 12.122.2.42 70 gbr4-p40.sl9mo.ip.att.net
> > > 16 12.122.2.205 60 gbr3-p40.cgcil.ip.att.net
> > > 17 12.123.5.145 60 ggr1-p360.cgcil.ip.att.net
> > > 18 207.88.50.253 90 unavailable
> > > 19 64.220.0.189 80 ge5-3-1.RAR1.Chicago-IL.us.xo.net
> > > 20 65.106.1.86 70 p0-0-0-0.RAR2.Chicago-IL.us.xo.net
> > > 21 65.106.0.34 60 p1-0-0.RAR1.Dallas-TX.us.xo.net
> > > 22 65.106.0.14 120 p6-0-0.RAR2.LA-CA.us.xo.net
> > > 23 64.220.0.99 80 ge1-0.dist1.lax-ca.us.xo.net
> > > 24 206.111.14.238 211 a2-0d2.dist1.sdg-ca.us.xo.net
> > > 25 209.31.222.150 80 unavailable
> > > 26 198.17.46.56 140 pinot.sdsc.edu
> > > 27 192.172.226.123 91 cider.caida.org
>
>
| Mathew Lodge | [email protected] |
| Director, Product Management | Ph: +1 408 789 4068 |
| CPLANE, Inc. | http://www.cplane.com |