From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Thu Mar 01 2001 - 14:32:03 GMT-3
Jim, in my case, the configuration is as follow:
router eigrp 100
redistribute ospf 599 metric 100 100 255 1 1500
network 20.0.0.0
no auto-summary
!
router ospf 599
redistribute eigrp 100 subnets
network 10.3.3.3 0.0.0.0 area 3
network 10.10.3.3 0.0.0.0 area 0
( yes I know. But I always screw with the eigrp metrics, just to see what
happens. And everything is working correctly now, with this identical
configuration )
Here is what SHOULD happen, and what NOW happens after the clear ip ospf
process:
R4 has a routing table that contains the eigrp external routes, with an AD
of 170 ( sorry - I was misusing the term "metric" in previous posts ) and
the eigrp metric.
OSPF becomes active, and the router sees routes with a better AD come into
the router, and installs them into the routing table. As shown from a debug
ip routing trace:
RT: closer admin distance for 10.1.0.0, flushing 1 routes
<-----------------------
RT: add 10.1.0.0/16 via 20.253.253.5, ospf metric [110/74]
<----------------------
RT: closer admin distance for 10.3.0.0, flushing 1 routes
RT: add 10.3.0.0/16 via 20.253.253.5, ospf metric [110/138]
RT: closer admin distance for 10.10.2.0, flushing 1 routes
RT: add 10.10.2.0/24 via 20.253.253.5, ospf metric [110/128]
This apparently did not happen when I originally built the network. Several
clear ip rout * did not yield this result.
Unfortunately I did not have the presence of mind to do the debug ip routing
at the time I was troubleshooting the original problem.
Chuck
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jim.Fickett@SAPPI-NA.COM
Sent: Thursday, March 01, 2001 9:16 AM
To: ccielab@groupstudy.com
Subject: RE: route artifact revisited
How is R3 configured to prevent the EIGRP route that is redistributed into
OSPF from being redistributed back into EIGRP and vice versa with OSPF to
EIGRP?
Jim Fickett
-----Original Message-----
From: Nodir Nazarov [mailto:nodir@datatone.com]
Sent: Thursday, March 01, 2001 11:44 AM
To: frank wells
Cc: ccielab@groupstudy.com
Subject: Re: route artifact revisited
By the way - I could reproduce Chuck's scenario.
To recap:
R1---R4
| |
R3--R6
R1 - ospf only, R6 - eigrp only. R3 - mutually distributes each other. R4
- runs both protocols, but does not redistribute.
On R4 I got connected router (between R1 and R3) as EIGRP external. Had it
at least for 17 minutes. Checked after 10 minutes - got right one. After a
while - EIGRP external showed up. So it's flapping.
EIGRP - 172.16.0.0
OSPF - 192.168.13.0 (between R1 and R3), 192.168.14.0 (R1 and R4)
Nodir
On Thu, 1 Mar 2001, frank wells wrote:
> What prefixs' are you using on the OSPF and EIGRP sides?
>
>
> >From: "Chuck Larrieu" <chuck@cl.cncdsl.com>
> >Reply-To: "Chuck Larrieu" <chuck@cl.cncdsl.com>
> >To: "CCIE_Lab Groupstudy List" <ccielab@groupstudy.com>
> >Subject: route artifact revisited
> >Date: Wed, 28 Feb 2001 23:12:41 -0800
> >
> >Practicing redistribution for the next couple of days. My strange
behaviour
> >of the evening:
> >
> >Ospf domain --------------EIGRP domain
> >Router_1-----------------------router_4 r4 runs ospf and eigrp but
> >does not redistribute
> >| /
> >Router_3----------Router_6 r3 redistributes both ways, r6 is
> >eigrp
> >only
> >
> >The artifact - a route directly connected to an interface on R1 shows up
on
> >R4 and an eigrp external with a metric of 170. All other ospf routes are
on
> >r4 as they should be, with a metric of 110
> >
> >Several clear ip route * does not correct the situation. I shut off
> >redistribution, do a clear ip ospf proc on R1, verify that the route in
> >question is an ospf route on r4, reconfigure redistribution, and now
> >everything is as it should be. I add redistribution back onto r3. The
route
> >in question remains an ospf route. I check the output of debug ip
routing,
> >and see that the ospf route is replacing the redistribute and now EIGRP
> >route in R4's table.
> >
> >I can derive no good explanation. If I recall how I built the lab
> >correctly,
> >it is true I did not add OSPF to R4 until last, after redistribution was
in
> >place on r3. So the eigrp route would have been in r4's table already.
But
> >then, so were all of the other ospf routes, and when ospf was built, they
> >appeared as ospf routes on r4
> >
> >I'm a bit puzzled by this. And open to a rational explanation.
> >
> >Chuck
> >----------------------
> >I am Locutus, a CCIE Lab Proctor. Xx_Brain_dumps_xX are futile. Your life
> >as
> >it has been is over ( if you hope to pass ) From this time forward, you
> >will
> >study US!
> >( apologies to the folks at Star Trek TNG )
> >
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