From: Godswill Oletu (oletu@inbox.lv)
Date: Thu Mar 23 2006 - 22:21:28 GMT-3
John,
I think these Routers are behaving exactly as configured. It look like your
route-reflector is working and the routing among all the BGP peers are
behaving as configured.
The question at the centre of this scenario is: Does BGP RR, reflect routes
to the other peer from only its best routes or it reflect all the routes in
its RIB?
You will notice that, all the best routes on R5 are the routes from BB3
(through R3) and as such R5 do not have any route to reflect back to R3,
because the best route that it have, it got it from R3; it only have new
routes to reflect back to R6.
To test this theory:
1. Advertise a route into BGP on R6, check R3's table for that route.
(if it is there then RR @ R5 is functioning and your BGP is working as
configured)
2. Configure load balancing on R5, this will make R5 to flag both routes as
Best. (I have not tested this) but since both routes will make it into its
routing table from its RIB; R5 should forward them to both R3 & R6.
HTH
Godswill
----- Original Message -----
From: "John Matus" <John.Matus@tokiom.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, March 21, 2006 3:50 PM
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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