From: Nick Shah (nshah@xxxxxxxxxxxxxx)
Date: Thu Jun 06 2002 - 06:17:05 GMT-3
Paul,
I have managed to get this one working.... I am posting the relevant configs
as under
R1 # doesnt have anything running except RIP...
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
C 200.100.100.0/24 is directly connected, Serial0
199.199.2.0/30 is subnetted, 1 subnets
C 199.199.2.4 is directly connected, Serial1
199.199.1.0/30 is subnetted, 1 subnets
C 199.199.1.0 is directly connected, Ethernet0
R2 #
router ospf 1
router-id 5.5.5.5 (keep this router id in mind, check below)
redistribute rip metric 20 subnets (redistributing RIP routes from R1)
network 199.199.1.1 0.0.0.0 area 0
network 199.199.2.1 0.0.0.0 area 0
network 199.199.3.1 0.0.0.0 area 0
!
router rip
network 199.199.1.0
!
router bgp 2
bgp router-id 9.9.9.9 (note this will is purposely different from the OSPF
router id)
neighbor 199.199.1.2 remote-as 1
neighbor 199.199.3.2 remote-as 3
no auto-summary
R3 #
router ospf 1
router-id 4.4.4.4
log-adjacency-changes
network 199.199.3.2 0.0.0.0 area 0
!
router bgp 3
bgp router-id 5.5.5.5 (note that this router id is same as ospf router id
on R2)
bgp cluster-id 67372036
bgp log-neighbor-changes
neighbor 199.199.2.2 remote-as 3
neighbor 199.199.3.1 remote-as 2
R4 #
R4#sh ip bg
BGP table version is 2, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i200.100.100.0 199.199.3.1 100 0 2 1 i
RouterB#sh ip bgp 200.100.100.0
BGP routing table entry for 200.100.100.0/24, version 2
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
199.199.4.2
2 1, (Received from a RR-client)
199.199.3.1 (metric 75) from 199.199.3.2 (5.5.5.5)
Origin IGP, localpref 100, valid, internal, synchronized, best
R4#
Now, I will also try to lab it up with Confeds and acheive the same result,
then without using OSPF (as steve suggested, using EIGRP or RIP)
rgds
Nick
-----Original Message-----
From: steven.j.nelson@bt.com <steven.j.nelson@bt.com>
To: p_chopin@yahoo.com <p_chopin@yahoo.com>; Eddy.Fong@hp.com
<Eddy.Fong@hp.com>
Cc: ccielab@groupstudy.com <ccielab@groupstudy.com>
Date: Thursday, 6 June 2002 5:56
Subject: RE:
>Guys
>
>Eddy is right, the problem is that the igp route from R2 is via ibgp and
the
>igp route is from R3 so BGP says these routes are from different sources
and
>therefore are "untrustworthy" so hence not synchronised.
>
>Confeds will work fine but you need to learn this one with and without
them.
>maybe use an igp that does not depend on RIDs such as eigrp etc etc.
>
>Have a play with it and know it back to front you'll need it.
>
>HTH
>
>Steve
>
>-----Original Message-----
>From: Paul [mailto:p_chopin@yahoo.com]
>Sent: 06 June 2002 06:24
>To: Fong, Eddy
>Cc: ccielab@groupstudy.com
>Subject: RE:
>
>
>Is there any remedy except confederations?
>Paul
>--- "Fong, Eddy" <Eddy.Fong@hp.com> wrote:
>> I think we have come across this issue before.
>> Anyway, it's because the IGP route 200.100.100.0/24
>> is from R2. But the iBGP route is from R3. When you
>> have OSPF as IGP and want to syn with BGP, the route
>> originator R-Ids have to be the same. Otherwaise
>> it's not synchronized and, hence, not advertise to
>> R5.
>>
>>
>> -----Original Message-----
>> From: Paul [mailto:p_chopin@yahoo.com]
>> Sent: Thursday, June 06, 2002 10:59 AM
>> To: ccielab@groupstudy.com
>> Subject:
>>
>>
>> Hi group,
>> I just run into another interesting little problem.
>> I have R1-R2---R3
>> | |
>> \ /
>> R4---R5
>> R1 is running RiP. R2,R3,R4,R5 are running ospf. R2
>> is
>> redistributing rip into ospf domain.R1 is inserting
>> route 200.100.100.0/24 to BGP through network
>> statement and Redistributing this route into Rip as
>> well. R1 is in AS1 , R2 in AS3, and R5,R4,R5 in As
>> 3.EBGP sessions R1-R2, R2-R3. IBGP sesions R3-R4,
>> R4-R5. R4 is route reflector.Synch is enable on all
>> the routers.Question is why on R4 BGP table says,
>> that
>> route 200.100.100.0/24 is not synchronized even it's
>> known through ospf and is not being pushed to R5.
>> All routers have hard coded identical routers id in
>> ospf and BGP.
>> I've been struggling almost a week with this one.I
>> searched and read white papers on CCO - I still
>> don't
>> understand.I'm missing really something important.
>> Can you help?
>> Paul
>>
>>
>>
>>
>>
This archive was generated by hypermail 2.1.4 : Tue Jul 02 2002 - 08:12:26 GMT-3