Migration from OSPF to EIGRP

[Mero Cisco]

Dear All,

I have implemented the OSPF routing at my office. Now, I want to migrate from OSPF to EIGRP. I have got lots of branch implemented with OSPF. How should I migrate OSPF to EIGRP without disturbing the existing network.

Regards,

Mero

[smitesh kharecha · Accepted solution]

Hi Mero,

Genrally the practice is to configure the EIGRP with higher AD as compared to OSPF ( done with distance command under eigrp), since EIGRP will have higher AD set, devices will not install EIGRP routes in routing table.

Once you have eigrp neighbourship and topology converged then you can start removing ospf.

Regards,

Smitesh

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[paolo bevilacqua]

And why you want to migrate away from a superior protocol ?

[Mero Cisco]

Dear Paolo,

My software is very much dependent with the ping response time as well as its smoothness in connection. I want to control my route according to the ping response. When ping fails for 2-3 times I want to dynamically route through another available link. I also want to change the route when the latency goes above some value.

Another advantage that I will get from EIGRP is the fast convergance.

I have not got the good material on this till now but heard that it is possible to fulful my requirement with EIGRP. Please explore about this and also suggest me which protocol should I use.

Regards,

Mero

[paolo bevilacqua]

Actually OSPF has same or better reconverge time as any other protocol, by  doing proper timer tuning.

Note that if you want to re-route on 'latency', no routing protocol can do that. Moreover if one circuit is congested and has high-latency, if you move traffic to another then the other will become eventually congested, so it is not a good solution.

What you should investigate instead is QoS for the critical application..

The most is  that you get advice from a certified Cisco engineer of proven experience before making decisions.

[smitesh kharecha · Accepted solution]

Hi Mero,

Based on your motivation for migrating to EIGRP instead on OSPF; I totally agree with Paolo. OSPF times can be tweaked to attend same reconvergence as in EIGRP. More over you pointed that your applications are latency and loss sensitive, on that you can have two options:

1. As suggested to by Paolo, you can do QoS for your critical applications.

                         OR

2. You can use Cisco's OER/PfR feature.

Unfortunately, I'm not comfortable with OER/PfR, where I can suggest you much, however you can refer Cisco Doc CD for more information on OER/PfR.

http://www.cisco.com/en/US/docs/ios-xml/ios/pfr/configuration/15-2mt/pfr-understand.html

Regards,

Smitesh

PS: Please rate helpful posts...