Cisco 2620 eigrp/ospf issues

Answered Question
Jul 9th, 2007
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Greetings,


I'm having issues getting a Cisco 2620 and a Dell Powerconnect 6024 to redistribute via eigrp/ospf correctly which are both at a remote location. I have attached a basic diagram to better show the topology. We have been unable to access the remote site from our main site (which is using a cisco 3600) without a static route for each subnet at the remote site. Hopefully this makes sense.


Cisco 2620 Config:


Building configuration...


Current configuration:

!

!

!

!

!

ip subnet-zero

!

lane client flush

cns event-service server

!

!

!

!

!

interface FastEthernet0/0

ip address 10.100.187.1 255.255.255.0

duplex auto

speed auto

!

interface Serial0/0

ip address 10.100.181.10 255.255.255.252

no ip mroute-cache

no fair-queue

!

router eigrp 100

redistribute connected

redistribute ospf 1

network 10.0.0.0

no auto-summary

!

router ospf 1

redistribute connected

redistribute eigrp 100 subnets

network 10.100.0.0 0.0.255.255 area 0.0.0.0

!

ip classless

ip route 0.0.0.0 0.0.0.0 10.100.181.9

no ip http server

!

!

banner motd ^CCC



Attachment: 
Correct Answer by Richard Burts about 9 years 10 months ago

Timothy


There are a couple of things that I am not clear about concerning your situation. Your diagram shows a single subnet between the Cisco and the Dell. Is everything in the Dell in that single subnet? If so I am not sure why you are running OSPF, since there will not be any OSPF routes to redistribute.


If the diagram is incomplete and there are routes in OSPF that need to redistribute to EIGRP then there is an issue in the configuration. There is no default metric configured under router EIGRP. Without a default metric routes from another protocol (OSPF) will not redistribute into EIGRP.


I think it is also an interesting question whether the 2620 and the 3600 routers are forming EIGRP neighbor relationships. Failure to form EIGRP neighbor relationships could also cause the symptoms that you describe.


HTH


Rick

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Correct Answer
Richard Burts Mon, 07/09/2007 - 17:55
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Timothy


There are a couple of things that I am not clear about concerning your situation. Your diagram shows a single subnet between the Cisco and the Dell. Is everything in the Dell in that single subnet? If so I am not sure why you are running OSPF, since there will not be any OSPF routes to redistribute.


If the diagram is incomplete and there are routes in OSPF that need to redistribute to EIGRP then there is an issue in the configuration. There is no default metric configured under router EIGRP. Without a default metric routes from another protocol (OSPF) will not redistribute into EIGRP.


I think it is also an interesting question whether the 2620 and the 3600 routers are forming EIGRP neighbor relationships. Failure to form EIGRP neighbor relationships could also cause the symptoms that you describe.


HTH


Rick

tbrooks25 Tue, 07/10/2007 - 05:23
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Rick,


The diagram I posted was very basic. We have 10 VLAN's at this remote location with different subnets for each one. All of the VLAN's are setup on the Dell.


What should the configuration look like then under the router eigrp? I posted the configuration in my first post which looks like this:


router eigrp 100

redistribute connected

redistribute ospf 1

network 10.0.0.0

no auto-summary


The 2620 and the 3600 are showing each other as eigrp neighbor's so again it leads me to believe that I have the configuration wrong on the eigrp.






tbrooks25 Tue, 07/10/2007 - 05:52
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Rick,


Your tip on the metric was correct! I specified the default metric for ospf. Please let me know if i should make changes to this line. The connection is a T-1.


redistribute ospf 1 metric 100 10 255 1 1500


Tim

Richard Burts Tue, 07/10/2007 - 08:04
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Tim


I am glad that you now have it working. While some people I know will try to tune the default metric to accurately reflect the performance of the local link, I usually do not bother. As long as the OSPF routes are redistributed it will not change the routing decisions whether the default metric is very small, very large, or somewhere in between.


Thanks for using the rating system to indicate that your issue was resolved (and thanks for the rating). It makes the forum more useful when people can read about an issue and can know that they will read the solution to the issue. I encourage you to continue your participation in the forum.


HTH


Rick

tbrooks25 Tue, 07/10/2007 - 05:07
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I am receiving ospf routes from the Dell to the 2620 and the expected neighbors are showing up.


The eigrp neighbor's are showing up correctly on the 2620 and the 2620 is receiving routes from the 3600. However when I look at the 3600 I don't see any routes from the 2620 even though the eigrp neighbor's are showing up.


At this point the only way for us to communicate to the dell from the main office is to put a static route on the 3600. This leads me to believe that I have the wrong eigrp configuration on the 2620 since the 3600 is not receiving updates.

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