Increasing EIGRP Metric's

[BlueyVIII]

Hello,

I have a need to redistribute a route into our network, however, as it passes over a particular link I want to increase the metric in order to prevent it clashing with a route that will be coming from another device.  Is there a way to do this using EIGRP?

Any help greatfully received. I spent a while googling and searching CSC but can't find anything that matches what I'm trying to do..

[Peter Paluch]

Hello,

You can either use the delay command on the interface on the link you mentioned to enter a high delay parameter. As EIGRP uses the delay to compute the overall metric, a higher delay will resut in higher metric, thus becoming less preferred. I suggest increasing the delay parameter to, say 500000 or more. No other router operation will be influenced by this configuration change. Note that all routes received via that interface will have their metric increased.

Another way would be to use an offset list to increase the delay parameter. The difference is that the offset-list can be made specific by referring to an ACL that allows only selected networks to have their metrics increased.

Which way would be the most usable for you - the delay command or the offset-list approach?

Best regards,

Peter

[BlueyVIII]

Hi Peter,

Thanks for your very clear reply. As I only want to increase the metric for a single particular learned route (in this case 0.0.0.0 0.0.0.0) I think the offset approach would be the most suitable. There will be other routes advertised on this link but I only want to increase the metric for the default route.

[Peter Paluch · Accepted solution]

Hello,

I see. The sample configuration could then be as follows:

access-list 1 permit 0.0.0.0
router eigrp ...
  offset-list 1 in 500000 FastEthernet0/1

assuming that the interface that receives the default route is Fa0/1.

Also please visit the links provided by Richard for further explanation of the entire offset-list feature.

Best regards,

Peter

[Richard Michael · Accepted solution]

Hi,

By using offset-list you have a precise control on which routes would need to have a increased metric or vice versa.

The whole offset saga is explained with an explanation in the below link, good one.

http://cciepursuit.wordpress.com/2008/12/30/secrets-of-the-eigrp-offset-list-command/

Cisco Doc :

http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfeigrp.html

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c2d96.shtml

Thanks,

Ricky Micky

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[BlueyVIII]

Thanks Peter & Richard - That's excatly what I wanted...