From: Raj Thava[IPC_Head Office] (traj@ipcc.ca)
Date: Fri Oct 11 2002 - 12:49:49 GMT-3
When you configure EIGRP, use the wild card mask with network command to
make sure only that network is taken under eigrp and then troubleshoot rest
of the problems.
Thank you
Raj Thava
CCIE#10425
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-----Original Message-----
From: Carlos G Mendioroz [mailto:tron@huapi.ba.ar]
Sent: October 11, 2002 11:33 AM
To: Adam Crisp
Cc: chenyan; ccielab
Subject: Re: redistribute problem
Adam,
I think the issue has nothing to do with AD.
I have an example:
R1 --- R2 --- R3
R1-R2 are running EIGRP 100 on 192.168.2.0/30
R2-R3 are running OSPF area 0 on 192.168.1.0/30
R3 has a loopback with OSPF area 0 192.168.100.1/24
R2 is redistributing OSPF into EIGRP, config like:
router eigrp 100
redistribute ospf 100
network 192.168.2.0
default-metric 1000 100 200 100 1000
no auto-summary
no eigrp log-neighbor-changes
!
router ospf 100
log-adjacency-changes
network 192.168.1.0 0.0.0.255 area 0
R2 routing:
192.168.1.0/30 is subnetted, 1 subnets
C 192.168.1.0 is directly connected, Serial1/3
192.168.2.0/30 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, Serial1/0
192.168.100.0/32 is subnetted, 1 subnets
O 192.168.100.1 [110/1563] via 192.168.1.2, 00:12:54, Serial1/3
R2 eigrp topo:
P 192.168.100.1/32, 1 successors, FD is 2585600
via Redistributed (2585600/0)
P 192.168.1.0/30, 1 successors, FD is 2585600
via Redistributed (2585600/0)
P 192.168.2.0/30, 1 successors, FD is 20512000
via Connected, Serial1/0
As you can see, EIGRP is taking ALL OSPF networks, even the connected
one from the OSPF redistribution.
The problem changes when you have multiple redistribution. What a
protocol will not redistribute is something that was learnt by
redistribution. (Something like a redistribution split horizon)
HTH
Adam Crisp wrote:
> this is all about Administrative distances and the fact that
redistribution
> between protocols only works if the route makes the Forwarding information
> base.
>
>
> Example
>
> If you have an EIGRP AS, with some external routes, the distance for those
> routes is 170 - an EIGRP external...
>
> If you then have two routers, both running EIGRP and both running OSPF
> Both routers are in the same EIGRP AS and the same OSPF area.
> Both routers are doing mutual redistribution and route maps are in place
to
> prevent routing loops.
> If you then look at the OSPF database, you'll see that only one of the
> Routers is advertiseing the external eigrp routes?
> If you kill the router that is advertising the routes - then the other one
> immediatly start advertising the route.
> Why?
>
> When the 1st router redistributes from EIGRP to OSPF, OSPF then has the
> route - with an external ospf distance of 110 !
> the second router is then presented with two routes to the external, 1 -
> eigrp 170, or ospf 110,
> the ospf route makes the FIB, and that router will not redistribute the
> route!
> When the first router is killed, then the second router has one option -
> eigrp 170, and this route makes the FIB, and this route is then
> redistributed!
>
> Hope this makes sense,
>
> I your example, your router has:
> OSPF - AD 110
> EIGRP - AD 90 (ext 170)
> connected = AD - 0
> ( and static is AD = 1)
>
> when you redistribute the connected into eigrp, the router has two routes
to
> the interface to consider, Eigrp AD-170 and Connected - AD-0
> the connected route makes the FIB.
>
> As the EIGRP route does not make the FIB, then this route will not be
> redistributed into OSPF
>
>
> Good luck
>
> Adam
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> chenyan
> Sent: 11 October 2002 05:06
> To: ccielab
> Subject: redistribute problem
>
>
> hi,all
>
> (eigrp)---R-----(ospf)
> |
> |
> E0
> mutual redistribution is implemended on R between eigrp and ospf,then I
> redistribute connected with E0 into eigrp, is it possible that I cant see
> the connected network in the ospf bacause of the mutual redistribution,
but
> why?
>
> Thanks
>
-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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