From: William Lijewski (ccie8642@hotmail.com)
Date: Mon Jul 21 2003 - 14:38:06 GMT-3
You are putting the route into BGP on R6 correct? If you put the route into
BGP on R6 it will be sent to its neighbor R5 as an External BGP route (it
will be seen as a best route on R5 since External BGP doesn't check for
synchronization). On R5 you would redistribute the BGP into the OSPF
(preferably using a route-map to limit which routes enter OSPF), this will
make the route look like it was originated in OSPF on R5. R5 will send the
route to R13 via OSPF and BGP. R13 being an Internal BGP neighbor to R5
will check the BGP routes against the IGP table to make sure it has an exact
match. R13 will see that it does have a match in the IGP table for the
route and it will also see that it was OSPF that originated the route, so it
will check to make sure that the OSPF and BGP ORIGIN router IDs of the route
match. R13 will see both the OSPF and BGP router IDs coming from R5 and
will put the route into the BGP table as a BEST route. R13 will see the
router ID of R5 as the BGP router ID even though it didn't truly originate
the route - The External BGP neighbor that learns the route will always bee
seen as the Origin for that AS.
Bill Lijewski
CCIE #8642
>From: Peng Zheng <zpnist@yahoo.com>
>To: William Lijewski <ccie8642@hotmail.com>
>CC: ccielab@groupstudy.com
>Subject: Re: route not synchronized
>Date: Mon, 21 Jul 2003 09:54:46 -0700 (PDT)
>
>But that route is directly connected to r6. I can
>only redistributing it from r6.
>
>
>--- William Lijewski <ccie8642@hotmail.com> wrote:
> > Is there some reason why you are redistributing the
> > route into OSPF on R6?
> > The router that you redistribute the BGP into the
> > OSPF will be the origin
> > for the OSPF. If you redistribute on R5 then R5
> > will show as the origin of
> > the route for OSPF, and your BGP and OSPF router IDs
> > will match up on R13.
> >
> > Bill Lijewski
> > CCIE #8642
> >
> >
> > >From: Peng Zheng <zpnist@yahoo.com>
> > >Reply-To: Peng Zheng <zpnist@yahoo.com>
> > >To: ccielab@groupstudy.com
> > >Subject: route not synchronized
> > >Date: Sun, 20 Jul 2003 14:23:22 -0700 (PDT)
> > >
> > >Connection:
> > > area 0
> > > R5------R13
> > > |
> > > |(area 1)
> > > |
> > > R6 (area 2)
> > >
> > >
> > >R6 in AS 10, R5 and R13 in AS 20.
> > >
> > >All of them run OSPF. Virtual link has been
> > configured
> > >between R5 and R6.
> > >
> > >Router-id for OSPF and BGP on all routers are same.
> > >For r5, it's 129.5.5.5. For r6, it 129.6.6.6. For
> > r13,
> > >it's 129.13.13.13.
> > >
> > >On r6, a network 62.9.1.0/24 is redistributerd into
> > >OSPF.
> > >
> > >I redistributed OSPF routes (included all kinds of
> > >routes) from R5 into BGP. But 62.9.1.0 are not
> > >synchronized on r13.
> > >
> > >------------------------------
> > >show ip route 62.9.1.0/24 on r13:
> > >
> > >Routing entry for 62.9.1.0/24
> > > Known via "ospf 1", distance 110, metric 20,
> > type
> > >extern 2, forward metric 128
> > >
> > > Last update from 192.168.1.5 on Serial0,
> > 00:36:02
> > >ago
> > > Routing Descriptor Blocks:
> > > * 192.168.1.5, from 129.6.6.6, 00:36:02 ago, via
> > >Serial0
> > > Route metric is 20, traffic share count is 1
> > >-------------------------------------
> > >sh ip bgp 62.9.1.0
> > >
> > >BGP routing table entry for 62.9.1.0/24, version 0
> > >Paths: (1 available, no best path)
> > > Not advertised to any peer
> > > Local
> > > 192.168.1.5 from 192.168.1.5 (129.5.5.5)
> > > Origin incomplete, metric 30, localpref 100,
> > >valid, internal, not synchronized
> > >
> > >-----------------------------------------------
> > >
> > >I noticed OSPF learned it from r6 and BGP learned
> > it
> > >from r5. So they are not synchronized.
> > >
> > >My question is if it's possible to make the route
> > >synchronized.
> > >
> > >
> > >Thanks for any reply.
> > >
> > >
> > >
> > >
> > >
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This archive was generated by hypermail 2.1.4 : Wed Aug 06 2003 - 06:52:47 GMT-3