From: Ivan (ivan@iip.net)
Date: Wed Jun 06 2007 - 13:46:15 ART
may be you forget clear ip bgp * after change in bgp router process ?
On Wednesday 06 June 2007 20:36, CCIE GOAL wrote:
> > Hi Ivan, thanks a lot for the reply.
> >
> > I will try the "mpls ip" alternative...
> >
> > But I found the problem here... now I am researching to find out
> > the "why"...
> >
> > The Problem:
> > The AS2 was receiving the prefixes from AS3 and then, for some reason,
> > the AS2 is treating the AS3 prefixes as internal and not external...
> >
> > When I tried to redistribute the BGP 2 into OSPF the AS3 prefixes could
> > not be sent as they are treated as internal...
> >
> > The Solution:
> > To solve this problem I had to add the "bgp redistribute-internal"...
> >
> > The "Why?":
> > Why the AS3 prefixes is treated as internal in AS2?
> > If someone knows, can please explain me that?
> >
> > Thanks a lot,
> > Luciano
> >
> > 2007/6/6, Ivan <ivan@iip.net>:
> > > The most simple solution is to run mpls between AS1 and AS2.
> > > You only must enter "mpls ip" command on all interface.
> > >
> > > Another point of view is that you haven't redistribution between OSPF
> > > and BGP.
> > > router ospf 1
> > > redistribute bgp 1 subnets
> > > router bgp 1
> > > redistribute ospf 1
> > >
> > > On Wednesday 06 June 2007 19:41, CCIE GOAL wrote:
> > > > Hi guys,
> > > >
> > > > I ran into a problem with BGP, maybe it's simple to resolve but I got
> > >
> > > stuck
> > >
> > > > on it.
> > > > People say that sometimes it is easier to spot the issue from outside
> > >
> > > the
> > >
> > > > picture...
> > > >
> > > > Scenario:
> > > >
> > > > [ BGP AS 1 ] -- (OSPF/not in bgp) -- [ BGP AS 2 ] -- [ BGP AS 3
> > >
> > > ]
> > >
> > > > - AS 1 is peering to AS 2
> > > > - AS 2 is peering to AS 3
> > > >
> > > > - Between AS 1 and AS 2; there is some devices in OSPF domain only
> > >
> > > (Not
> > >
> > > > BGP).
> > > >
> > > > - AS 3 is announcing some prefixes, let's say 10.10.X.0/24...
> > > >
> > > > These prefixes are pingable from AS 2 but not from AS 3 even the BGP
> > >
> > > table
> > >
> > > > from AS 3 has these prefix as valid.
> > > >
> > > > The issue is that the OSPF domain do not know how to reach the
> > >
> > > prefixes
> > >
> > > > 10.10.X.0/24.
> > > >
> > > > I am not allowed to use static routes anywhere...
> > > > I have tried to redistribute BGP 2 into OSPF but no success, it seems
> > >
> > > that
> > >
> > > > eBGP learned prefixes are not redistributed...
> > > >
> > > > Can somebody help me on this?
> > > >
> > > > Follow the configs:
> > > >
> > > >
> > > > ---------------------------------------------------
> > > > AS1#
> > > > router bgp 1
> > > > no synchronization
> > > > neighbor 2.2.2.2 remote-as 2
> > > > no auto-summary
> > > > !
> > > > router ospf 1
> > > > network 10.10.1.1 0.0.0.0 area 1
> > > >
> > > > ---------------------------------------------------
> > > > OSPF#
> > > > router ospf 1
> > > > network 10.10.1.2 0.0.0.0 area 1
> > > > network 10.10.2.2 0.0.0.0 area 0
> > > >
> > > > ---------------------------------------------------
> > > > AS2#
> > > > router bgp 2
> > > > no synchronization
> > > > neighbor 1.1.1.1 remote-as 1
> > > > neighbor 3.3.3.3 remote-as 3
> > > > no auto-summary
> > > > !
> > > > router ospf 1
> > > > network 10.10.2.1 0.0.0.0 area 0
> > > > ---------------------------------------------------
> > > >
> > > > AS3#
> > > > router bgp 3
> > > > no synchronization
> > > > neighbor 2.2.2.2 remote-as 2
> > > > no auto-summary
> > > > ---------------------------------------------------
> > > >
> > > >
> > > > Thanks in advance,
> > > > Luciano
> > >
> > > _______________________________________________________________________
> > >
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