From: Jian Gu (guxiaojian@gmail.com)
Date: Wed Mar 22 2006 - 16:59:01 GMT-3
I think you are exaclty right, now I remeber I had similar situation before.
On 3/22/06, ccie2k4 <ccie2k4@gmail.com> wrote:
>
> Hi All,
>
> Apologize but I am just diving in here right now so please pardon any
> incorrect assumptions. From the scenario above I gather that the problem
is
> that R6 is getting 2 paths in its BGP RIB and R3 is not getting it.
> Everything else seems to be working correctly. Please do correct me if I
> have misunderstood the actual problem.
>
> Now my take on this is that R5 is learning the routes from R3 and R6. BGP
> will advertise only its best routes to other neighbors. However based on
the
> best path algorithm R5 is choosing the path from R3 as the best path. Hence
> it is advertising it to R6 & R4. I don't think it would advertise it back
to
> R3 as it received the route from there. Please let me know if I am
> incorrect.
>
>
> On 3/22/06, Jian Gu <guxiaojian@gmail.com > wrote:
> >
> > It shouldn't matter, as synchronization is turned off, even 54.1.1.254is
> > not pingable, the updates should still show up in BGP table.
> >
> > I would "debug ip bgp <neighbor> updates" on R3, R5, it should give you
> > the
> > reason why BGP updates from R6 did not show up on R3/R4's BGP table.
> >
> > On 3/21/06, Marius Venter <marius@aict.co.za> wrote:
> > >
> > > Hi John
> > >
> > > To add to my previous post.
> > >
> > > I only got to the actual post now.
> > >
> > > I am just wondering if you could ping the 54.1.1.254 from router 3 and
> > 5.
> > >
> > > If you can I am also baffled.
> > >
> > > My gut feel however suggests that if you can't you should consider the
> >
> > > next
> > > hop self option as discussed in the previous post or you should
> > > redistribute
> > > the 54.1.1.0 address into an IGP process on router 6.
> > >
> > > Just a thought.
> > >
> > > Marius Venter
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com ] On Behalf
> > Of
> > > John
> > > Matus
> > > Sent: Tuesday, March 21, 2006 10:50 PM
> > > To: ccielab@groupstudy.com
> > > Subject: bgp frustration IE lab 1
> > >
> > > ok, this is frustrating me to no end...........and i used to be so
> > good w/
> > > bgp
> > > this is lab 1 IE 3.0
> > >
> > > R3, R4, R5, R6 are all in AS 100
> > > R5 is a route-reflector for all other routers in the AS. AS 100 is
> > > learning prefixes from AS 54 from 2 connections, R3 and R6, but the
> > routes
> > > are not propagating as expected........i would expect R3 and R6 to
> > > advertise to R5 which would then advertise to R4 and back to the
> > spokes.
> > > but here is what i get in my BGP tables.
> > >
> > > R3
> > >
> > > r3#bb
> > > BGP table version is 78, local router ID is 150.1.3.3
> > > Status codes: s suppressed, d damped, h history, * valid, > best, i -
> > > internal,
> > > r RIB-failure, S Stale
> > > Origin codes: i - IGP, e - EGP, ? - incomplete
> > >
> > > Network Next Hop Metric LocPrf Weight Path
> > > *> 28.119.16.0/24 204.12.1.254 0 0 54 i
> > > *> 28.119.17.0/24 204.12.1.254 0 0 54 i
> > > *> 112.0.0.0 204.12.1.254 0 54 50 60
> > i
> > > *> 113.0.0.0 204.12.1.254 0 54 50 60
> > i
> > > *> 114.0.0.0 204.12.1.254 0 54 i
> > > *> 115.0.0.0 204.12.1.254 0 54 i
> > > *> 116.0.0.0 204.12.1.254 0 54 i
> > > *> 117.0.0.0 204.12.1.254 0 54 i
> > > *> 118.0.0.0 204.12.1.254 0 54 i
> > > *> 119.0.0.0 204.12.1.254 0 54 i
> > > * i205.90.31.0 183.1.58.8 0 100 0 200 254
> > ?
> > > *> 183.1.123.1 0 200 254 ?
> > > * i220.20.3.0 183.1.58.8 0 100 0 200 254 ?
> > > *> 183.1.123.1 0 200 254 ?
> > > * i222.22.2.0 183.1.58.8 0 100 0 200 254 ?
> > > *> 183.1.123.1 0 200 254 ?
> > >
> > >
> > > r4#bb
> > > BGP table version is 174, local router ID is 150.1.4.4
> > > Status codes: s suppressed, d damped, h history, * valid, > best, i -
> > > internal,
> > > r RIB-failure, S Stale
> > > Origin codes: i - IGP, e - EGP, ? - incomplete
> > >
> > > Network Next Hop Metric LocPrf Weight Path
> > > *>i28.119.16.0/24 204.12.1.254 0 100 0 54 i
> > > *>i28.119.17.0/24 204.12.1.254 0 100 0 54 i
> > > *>i112.0.0.0 204.12.1.254 0 100 0 54 50 60
> > i
> > > *>i113.0.0.0 204.12.1.254 0 100 0 54 50 60
> > i
> > > *>i114.0.0.0 204.12.1.254 0 100 0 54 i
> > > *>i115.0.0.0 204.12.1.254 0 100 0 54 i
> > > *>i116.0.0.0 204.12.1.254 0 100 0 54 i
> > > *>i117.0.0.0 204.12.1.254 0 100 0 54 i
> > > *>i118.0.0.0 204.12.1.254 0 100 0 54 i
> > > *>i119.0.0.0 204.12.1.254 0 100 0 54 i
> > > *>i205.90.31.0 183.1.58.8 0 100 0 200 254 ?
> > > *>i220.20.3.0 183.1.58.8 0 100 0 200 254 ?
> > > *>i222.22.2.0 183.1.58.8 0 100 0 200 254 ?
> > > r4#
> > >
> > >
> > > r5#bb
> > > BGP table version is 294, local router ID is 150.1.5.5
> > > Status codes: s suppressed, d damped, h history, * valid, > best, i -
> > > internal,
> > > r RIB-failure, S Stale
> > > Origin codes: i - IGP, e - EGP, ? - incomplete
> > >
> > > Network Next Hop Metric LocPrf Weight Path
> > > * i28.119.16.0/24 54.1.1.254 0 500 0 54 i
> > > *>i 204.12.1.254 0 100 0 54 i
> > > * i28.119.17.0/24 54.1.1.254 0 500 0 54 i
> > > *>i 204.12.1.254 0 100 0 54 i
> > > * i112.0.0.0 54.1.1.254 0 100 0 54 50 60
> > i
> > > *>i 204.12.1.254 0 100 0 54 50 60
> > i
> > > * i113.0.0.0 54.1.1.254 0 100 0 54 50 60
> > i
> > > *>i 204.12.1.254 0 100 0 54 50 60
> > i
> > > * i114.0.0.0 54.1.1.254 0 500 0 54 i
> > > *>i 204.12.1.254 0 100 0 54 i
> > > * i115.0.0.0 54.1.1.254 0 500 0 54 i
> > > *>i 204.12.1.254 0 100 0 54 i
> > > * i116.0.0.0 54.1.1.254 0 500 0 54 i
> > > *>i 204.12.1.254 0 100 0 54 i
> > > * i117.0.0.0 54.1.1.254 0 500 0 54 i
> > > *>i 204.12.1.254 0 100 0 54 i
> > > * i118.0.0.0 54.1.1.254 0 500 0 54 i
> > > Network Next Hop Metric LocPrf Weight Path
> > > *>i 204.12.1.254 0 100 0 54 i
> > > * i119.0.0.0 54.1.1.254 0 500 0 54 i
> > > *>i 204.12.1.254 0 100 0 54 i
> > > * i205.90.31.0 183.1.123.1 0 100 0 200 254 ?
> > > *> 183.1.58.8 0 200 254 ?
> > > * i220.20.3.0 183.1.123.1 0 100 0 200 254 ?
> >
> > > *> 183.1.58.8 0 200 254 ?
> > > * i222.22.2.0 183.1.123.1 0 100 0 200 254 ?
> >
> > > *> 183.1.58.8 0 200 254 ?
> > > r5#
> > >
> > >
> > >
> > > r6#bb
> > > BGP table version is 14, local router ID is 150.1.6.6
> > > Status codes: s suppressed, d damped, h history, * valid, > best, i -
> > > internal,
> > > r RIB-failure, S Stale
> > > Origin codes: i - IGP, e - EGP, ? - incomplete
> > >
> > > Network Next Hop Metric LocPrf Weight Path
> > > * i28.119.16.0/24 204.12.1.254 0 100 0 54 i
> > > *> 54.1.1.254 500 0 54 i
> > > * i28.119.17.0/24 204.12.1.254 0 100 0 54 i
> > > *> 54.1.1.254 500 0 54 i
> > > * i112.0.0.0 204.12.1.254 0 100 0 54 50 60
> > i
> > > *> 54.1.1.254 0 0 54 50 60
> > i
> > > * i113.0.0.0 204.12.1.254 0 100 0 54 50 60
> > i
> > > *> 54.1.1.254 0 0 54 50 60
> > i
> > > * i114.0.0.0 204.12.1.254 0 100 0 54 i
> > > *> 54.1.1.254 0 500 0 54 i
> > > * i115.0.0.0 204.12.1.254 0 100 0 54 i
> > > *> 54.1.1.254 0 500 0 54 i
> > > * i116.0.0.0 204.12.1.254 0 100 0 54 i
> > > *> 54.1.1.254 0 500 0 54 i
> > > * i117.0.0.0 204.12.1.254 0 100 0 54 i
> > > *> 54.1.1.254 0 500 0 54 i
> > > * i118.0.0.0 204.12.1.254 0 100 0 54 i
> > > Network Next Hop Metric LocPrf Weight Path
> > > *> 54.1.1.254 0 500 0 54 i
> > > * i119.0.0.0 204.12.1.254 0 100 0 54 i
> > > *> 54.1.1.254 0 500 0 54 i
> > > *>i205.90.31.0 183.1.58.8 0 100 0 200 254 ?
> > > *>i220.20.3.0 183.1.58.8 0 100 0 200 254
> > ?
> > > *>i222.22.2.0 183.1.58.8 0 100 0 200 254 ?
> > > r6#
> > >
> > >
> > > now it appears that R6 is learning the prefixes from AS 54 from r3 as
> > well
> > > as BB1, but R3 is not learning the prefixes that R6 is learning from
> > BB1.
> > > in addition, i have a local-pref set to route to BB1, but it seems to
> > be
> > > choosing internal routes rather than BGP routes and i have no idea
> > where
> > > it
> > > is getting these internal routes since i did not redistribute BGP into
> > > IGP.
> > >
> > > ANY IDEAS??
> > > TIA
> > > Regards,
> > >
> > > John D. Matus
> > > Technical Support / PAS
> > > Fujitsu Consulting
> > > 626-568-7716
> > > John.Matus@tokiom.com
> > >
> > >
> >
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