remember the "diameter of the internet"?

Tue Jun 18 18:34:34 UTC 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                 | mathew at cplane.com     |
| Director, Product Management | Ph: +1 408 789 4068   |
| CPLANE, Inc.                 | http://www.cplane.com | 