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Doubt to check the priority of OSPF learned route.


Hi  all ¡¡

I have a virtual environment mounted with Gns3.

I have an environment of several L3 switches 3600 Software (C3640-IK9O3S-M), Version 12.4(25b) connected to area 0 OSPF.

Specifically, a switch connects through 2 different networks to area 0. It learns a network twice ( from 2 different neighbors, each of them on a different network. I don't know how I can see why it chooses one or the other route, when adding it  to the route table. He always chooses the same destination in to the routing table and only if that neighbor is down, does he put the other one. Could you tell me why it takes one route and not the other? How can I see it?

"SW1#show ip route
Routing entry for
Known via "ospf 1", distance 110, metric 20, type extern 2, forward metric 1
Last update from on Vlan404, 00:20:28 ago
Routing Descriptor Blocks:
*, from, 00:20:28 ago, via Vlan404
Route metric is 20, traffic share count is 1"

CORE#show ip ospf database 1368 0x80000001 0x00DE2F 0 1367 0x80000001 0x00D834 0


I understand that if I don't have the route twice in the route table, is it because one has better costs than the other? Or maybe because you learn on different networks in the same area?

Thanks '¡¡¡¡¡


15 Replies 15

You are so so welcome

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