RIP - path selection

From: Paul Chen (cpjchen@starhub.net.sg)
Date: Sat Jan 24 2004 - 23:29:05 GMT-3


Hi All,

Given the same metric values how does RIP decide which path to choose to a
destination network ?

I know that equal cost load balancing takes place but in this scenario , one
path is chosen over the other :

R3 R2

    \ /

     R5

R 141.37.106.0/24 [120/1] via 141.37.25.2, 00:00:03, Serial0

                                 [120/1] via 141.37.35.3, 00:00:03, Serial1

R 141.37.101.0/24 [120/1] via 141.37.25.2, 00:00:03, Serial0

                                 [120/1] via 141.37.35.3, 00:00:03, Serial1

R5#

R5#sh ip ro 141.37.101.0

Routing entry for 141.37.101.0/24

  Known via "rip", distance 120, metric 1

  Redistributing via rip

  Last update from 141.37.25.2 on Serial0, 00:00:11 ago

  Routing Descriptor Blocks:

  * 141.37.25.2, from 141.37.25.2, 00:00:11 ago, via Serial0
<-------------------- This path to R2 is chosen over R3

      Route metric is 1, traffic share count is 1

    141.37.35.3, from 141.37.35.3, 00:00:16 ago, via Serial1

      Route metric is 1, traffic share count is 1

R2 is chosen over R3 even though the metric values are the same ?

Any help appreciated.

Thanks.

Paul



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