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RE: Network for Sale

  • From: Przemyslaw Karwasiecki
  • Date: Wed Feb 21 10:53:42 2001

<Disclaimer>
Please don't flame me if I am doing something wrong.
Just tell me how to do it better.
</Disclaimer>

We are advertising 2 /20 which can be (theoretically) aggregated 
to one /19

route-server.cerf.net>sh ip bgp 200.62.0.0 
BGP routing table entry for 200.62.0.0/20, version 5199340
Paths: (4 available, best #3)
  Not advertised to any peer
  1740 4006 18747
    198.32.176.25 from 198.32.176.25 (134.24.127.39)
      Origin IGP, metric 20, localpref 100, valid, external
  1740 4006 18747
    192.41.177.69 from 192.41.177.69 (134.24.127.131)
      Origin IGP, metric 20, localpref 100, valid, external
  1740 4006 18747
    192.157.69.5 from 192.157.69.5 (134.24.127.201)
      Origin IGP, metric 20, localpref 100, valid, external, best
  1740 4006 18747
    134.24.88.55 from 134.24.88.55 (134.24.127.27)
      Origin IGP, metric 20, localpref 100, valid, external

route-server.cerf.net>sh ip bgp 200.62.16.0
BGP routing table entry for 200.62.16.0/20, version 5199341
Paths: (4 available, best #1)
  Not advertised to any peer
  1740 4006 18747
    192.157.69.5 from 192.157.69.5 (134.24.127.201)
      Origin IGP, metric 20, localpref 100, valid, external, best
  1740 4006 18747
    198.32.176.25 from 198.32.176.25 (134.24.127.39)
      Origin IGP, metric 20, localpref 100, valid, external
  1740 4006 18747
    192.41.177.69 from 192.41.177.69 (134.24.127.131)
      Origin IGP, metric 20, localpref 100, valid, external
  1740 4006 18747
    134.24.88.55 from 134.24.88.55 (134.24.127.27)
      Origin IGP, metric 20, localpref 100, valid, external
route-server.cerf.net>

The reason for doing this is simple:
First /20 is in US, second /20 is in VE
and I want to advertise Venezuelan part (and only this)
to some local VE provider in addition to NetRail.

If I would advertise aggregated /19 to NetRail,
I would receive all traffic for this multihomed /20
only from second VE provider, as more specific advertisement
would be preferred in route selection process.

Maybe they are doing the same.

Przemek


-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
Omachonu Ogali
Sent: Wednesday, February 21, 2001 9:56 AM
To: Brandon Ross
Subject: Re: Network for Sale



On Tue, Feb 20, 2001 at 11:08:58PM -0500, Brandon Ross wrote:
> 
> On Tue, 20 Feb 2001, Nathan Stratton wrote:
> 
> > On Tue, 20 Feb 2001, Roy wrote:
> > 
> > > Sold???
> > >
> > > 360networks Snags NetRail
> > >
> > > http://www.broadbandweek.com/newsdirect/0102/direct010220.htm
> > 
> > If they do I bet they don't know what they are getting into. NetRail still
> > has a mess in the past that they need to clean up before they start fixing
> > the current mess they have.
> 
> And exactly which part of your mess do you think I haven't cleaned up yet?
> Pray do tell.

Netrail's unnecessary deaggregated routes.

BGP table version is 548878, local router ID is 216.74.127.225
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
--snip--
*  64.253.0.0/19    157.130.59.13                 100      0 701 4006 i
*  64.253.9.0/24    157.130.59.13                 100      0 701 4006 i
*  64.253.10.0/24   157.130.59.13                 100      0 701 4006 i
--snip--

Why announce two /24s terminating at the same AS out of the larger /19?

--snip--
*  131.226.0.0/19   157.130.59.13                 100      0 701 4006 i
*  131.226.0.0      157.130.59.13                 100      0 701 4006 ?
*  131.226.32.0/19  157.130.59.13                 100      0 701 4006 i
*  131.226.64.0/19  63.211.88.5                   100      0 3356 4006 i
*  131.226.96.0/19  63.211.88.5                   100      0 3356 4006 i
*  131.226.128.0/19 157.130.59.13                 100      0 701 4006 i
--snip--

Why announce four /19s terminating at the same AS out of the larger /16?

--snip--
*  205.215.0.0/18   157.130.59.13                 100      0 701 4006 ?
*  205.215.11.0     157.130.59.13                 100      0 701 4006 i
*  205.215.14.0     157.130.59.13                 100      0 701 4006 ?
*  205.215.36.0     63.211.88.5                   100      0 3356 4006 i
*  205.215.37.0     157.130.59.13                 100      0 701 4006 i
*  205.215.38.0     157.130.59.13                 100      0 701 4006 i
*  205.215.42.0     157.130.59.13                 100      0 701 4006 i
*  205.215.44.0     157.130.59.13                 100      0 701 4006 i
*  205.215.48.0     157.130.59.13                 100      0 701 4006 i
*  205.215.51.0     157.130.59.13                 100      0 701 4006 i
*  205.215.52.0     157.130.59.13                 100      0 701 4006 i
*  205.215.55.0     157.130.59.13                 100      0 701 4006 ?
*  205.215.56.0     157.130.59.13                 100      0 701 4006 i
*  205.215.57.0     157.130.59.13                 100      0 701 4006 i
*  205.215.58.0     157.130.59.13                 100      0 701 4006 i
*  205.215.62.0     157.130.59.13                 100      0 701 4006 i
--snip--

Why announce fifteen /24s terminating at the same AS out of the
larger /18?

--snip--
*  207.31.64.0/18   157.130.59.13                 100      0 701 4006 ?
*  207.31.72.0      157.130.59.13                 100      0 701 4006 i
*  207.31.74.0      157.130.59.13                 100      0 701 4006 i
*  207.31.76.0      157.130.59.13                 100      0 701 4006 i
*  207.31.81.0      157.130.59.13                 100      0 701 4006 i
*  207.31.82.0      157.130.59.13                 100      0 701 4006 i
*  207.31.83.0      157.130.59.13                 100      0 701 4006 i
*  207.31.84.0      157.130.59.13                 100      0 701 4006 i
*  207.31.87.0      157.130.59.13                 100      0 701 4006 ?
*  207.31.92.0/22   157.130.59.13                 100      0 701 4006 i
*  207.31.96.0/21   157.130.59.13                 100      0 701 4006 ?
*  207.31.104.0/21  157.130.59.13                 100      0 701 4006 i
*  207.31.115.0     157.130.59.13                 100      0 701 4006 i
*  207.31.118.0     157.130.59.13                 100      0 701 4006 i
*  207.31.120.0     157.130.59.13                 100      0 701 4006 ?
*  207.31.123.0     157.130.59.13                 100      0 701 4006 i
--snip--

Why announce twelve /24s, two /21s, and one /22 terminating at the
same AS out of the larger /18?

--snip--
*  207.153.64.0/18  157.130.59.13                 100      0 701 4006 ?
*  207.153.72.0     157.130.59.13                 100      0 701 4006 i
*  207.153.73.0     157.130.59.13                 100      0 701 4006 i
*  207.153.74.0     157.130.59.13                 100      0 701 4006 i
*  207.153.75.0     157.130.59.13                 100      0 701 4006 i
*  207.153.84.0/23  157.130.59.13                 100      0 701 4006 i
*  207.153.90.0     157.130.59.13                 100      0 701 4006 i
*  207.153.92.0     157.130.59.13                 100      0 701 4006 i
*  207.153.93.0     157.130.59.13                 100      0 701 4006 i
*  207.153.98.0/23  157.130.59.13                 100      0 701 4006 i
*  207.153.102.0    157.130.59.13                 100      0 701 4006 i
*  207.153.104.0    157.130.59.13                 100      0 701 4006 i
*  207.153.108.0    157.130.59.13                 100      0 701 4006 i
*  207.153.110.0    157.130.59.13                 100      0 701 4006 i
*  207.153.111.0    157.130.59.13                 100      0 701 4006 i
*  207.153.115.0    157.130.59.13                 100      0 701 4006 i
*  207.153.121.0    157.130.59.13                 100      0 701 4006 ?
*  207.153.122.0    157.130.59.13                 100      0 701 4006 i
*  207.153.124.0    157.130.59.13                 100      0 701 4006 ?
*  207.153.127.0    157.130.59.13                 100      0 701 4006 i
--snip--

Why announce seventeen /24s, and two /23s terminating at the same
AS out of the larger /18?

--snip--
*  209.44.64.0/23   157.130.59.13                 100      0 701 4006 i
*  209.44.64.0/18   157.130.59.13                 100      0 701 4006 ?
*  209.44.66.0      157.130.59.13                 100      0 701 4006 i
*  209.44.68.0/22   157.130.59.13                 100      0 701 4006 i
*  209.44.72.0      157.130.59.13                 100      0 701 4006 i
*  209.44.76.0/22   157.130.59.13                 100      0 701 4006 i
*  209.44.81.0      157.130.59.13                 100      0 701 4006 i
*  209.44.82.0      157.130.59.13                 100      0 701 4006 ?
*  209.44.85.0      157.130.59.13                 100      0 701 4006 i
*  209.44.87.0      157.130.59.13                 100      0 701 4006 i
*  209.44.114.0     157.130.59.13                 100      0 701 4006 i
*  209.44.116.0     157.130.59.13                 100      0 701 4006 i
*  209.44.127.0     157.130.59.13                 100      0 701 4006 i
--snip--

Why announce nine /24s, two /22s, and one /23 terminating at the
same AS out of the larger /18?

And I won't even start on the other ASes hanging off of NetRail...

> Brandon Ross                                                 404-522-5400
> EVP Engineering, NetRail                           http://www.netrail.net
> AIM:  BrandonNR                                             ICQ:  2269442
> Read RFC 2644! 

-- 
Omachonu Ogali
missnglnk@informationwave.net
http://www.informationwave.net






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