From: ccie2k4 (ccie2k4@gmail.com)
Date: Wed Mar 22 2006 - 14:19:33 GMT-3
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 54.1.1.254 is
> 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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