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Community Member

Migrating from EIGRP to OSPF

Hi,

Can anybody assist me how to migrate from EIGRP to OSPF while in production environment in order to avoid any outage.

Best Regards,

Rahim Amir Ali

9 REPLIES
Community Member

Re: Migrating from EIGRP to OSPF

After redistribution please use *****clear ip route **** subnet in which want to reset the connection.

Community Member

Re: Migrating from EIGRP to OSPF

Hi,

I mean to say is there any detailed document which can guide me in migrating from eigrp to ospf.

BR,

Rahim

Hall of Fame Super Silver

Re: Migrating from EIGRP to OSPF

Hello Rahim,

here are possible two approaches:

a) deploy OSPF in parallel with EIGRP in all routers in the domain. For the higher AD of OSPF in comparison to EIGRP's AD no changes in the routers routing tables and no issues/impacts.

OSPF database will be populated in all routers.

Using the command sh ip ospf database you can compare the OSPF topology to the EIGRP topology.

(sh ip eigrp topology)

If OSPF DB information is complete the last step to be done in a maintanaince window is:

change the AD of all EIGRP routes (including summary routes to values greater then 110)on all routers.

Verify IP connectivity.

If everything is fine your migration is ended successfully.

b) you could use an approach with ASBR routers:

you divide your EIGRP domain in sub-domains and start to introduce OSPF in the core.

Routers connecting each sub-domain to core will implement EIGRP to OSPF redistribution and can inject a default route to the internal routers or can redistribute also from OSPF to their EIGRP process (in a controlled filtered way)

Later, you migrate each EIGRP sub-domain to OSPF in the same way as described in point A.

We used approach A some years ago to migrate a mobile phone provider IP network with good results.

Hope to help

Giuseppe

Community Member

Re: Migrating from EIGRP to OSPF

Hi,

Thanks Giuseppe. Any document that you would suggest that explains the migration in more detail from the configuration point of view as well.

Best Regards,

Rahim

Hall of Fame Super Silver

Re: Migrating from EIGRP to OSPF

Hello Rahim,

I didn't find a specific document about migration.

this can be helpful

http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/routed-ex.html

and in general have a look at

www.cisco.com/go/srnd

Hope to help

Giuseppe

Community Member

Re: Migrating from EIGRP to OSPF

Thanks for the help Giuseppe. I would like to have a detailed document if someone else can help me out on this.

Your help is required in this regard.

BR,

Rahim

Community Member

Re: Migrating from EIGRP to OSPF

Hi,

Can anybody help me out on this.

BR,

Rahim

Community Member

Re: Migrating from EIGRP to OSPF

The answer has been provided by previous posters. If you dont understand the issues and procedures then you are incapable of carrying out this project.

Community Member

Re: Migrating from EIGRP to OSPF

Well, I do not need to answer you on the forum since you will not like my answer. Anyways I would recommend you to stop using this forum since this forum is for learning and not commenting on anyone's capabilities.

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