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Redistribution seed metrics
By stretch | Friday, November 7, 2008 at 1:40 a.m. UTC
Redistributed routes are treated differently depending on which routing protocol they are being redistributed into. On IOS, each routing protocol has its own seed metric which is assigned by default to redistributed routes when no metric is configured manually. Below is a table listing the default behavior when no metric is defined with the metric argument on the redistribute command.
| Source | RIP | EIGRP | OSPF | ISIS | BGP (MED) |
|---|---|---|---|---|---|
| Connected | 1 | Int metric | 20 (E2) | 0 | 0 |
| Static | 1 | Int metric | 20 (E2) | 0 | 0 |
| RIP | -- | Infinite | 20 (E2) | 0 | IGP metric |
| EIGRP | Infinite | -- | 20 (E2) | 0 | IGP metric |
| OSPF | Infinite | Infinite | -- | 0 | IGP metric |
| ISIS | Infinite | Infinite | 20 (E2) | -- | IGP metric |
| BGP | Infinite | Infinite | 1 (E2) | 0 | -- |
As illustrated in the table, routes being distributed from another routing protocol into RIP or EIGRP must have a configured metric to be eligible for placement in the RIP database or EIGRP topology. Also interesting to note is that BGP will automatically assigned the IGP-learned metric of a redistributed route to the route's MED in the BGP table.
Posted in Routing
Comments
November 7, 2008 at 10:12 p.m. UTC
awesomeness, pure awesomeness
November 21, 2008 at 9:42 a.m. UTC
Hey - is it possible to find this info on the cisco website as I've spend 2 days without a luck ? Did you find any refrence for seed metric values for Juniper ?
December 8, 2008 at 9:35 p.m. UTC
Patryk, check page 384-386 in the book Building Scalable Cisco Internetworks (BSCI) Third Edition. A book used for CCNP learning.
December 28, 2010 at 7:55 a.m. UTC
Super cool..
July 25, 2012 at 12:05 p.m. UTC
Thanks for this excellent information.
February 27, 2013 at 11:27 p.m. UTC
Great Post,
God Bless you for this great work and clarifications.
Keep doing well and sharing this great info.
March 11, 2013 at 9:19 p.m. UTC
Thanks a lot for all of the valuable information Jeremy. It's very big of you to share your knowledge and experience.
March 25, 2014 at 12:59 p.m. UTC
Hi does seed metric value is differ in ipv6 supported routing protocol
July 1, 2014 at 4:02 p.m. UTC
Is possible to redistribute the native RIP metric into EIGRP?
I mean, if I receive the same RIP route in two differents routers and I want to redistribute it into EIGRP, how I can redistribute it into EIGRP with different metrics dynamically?
August 22, 2014 at 5:40 a.m. UTC
Very useful information. You are great, thanks a lot!
November 23, 2014 at 12:21 p.m. UTC
Nice
June 3, 2015 at 5:05 a.m. UTC
I like the way you explain in simple english..
October 12, 2015 at 3:21 a.m. UTC
nice post, thank you
February 2, 2016 at 9:01 a.m. UTC
Great post, helps a lot!