changing cost in ospf

[lex18]

Hi, I have created a network, using packet tracer, in which I have implemented the ospf protocol. I have given different values to cost per link, but when I look in the route table, the path is not that with the lowest cost and I cannot understand why. Here are some screenshots.

The numbers with bold next to a network is their cost

Thank you for your time

[David Ruess]

Hello,

A couple of things to note:

OSPF cost is one way. So if you configure a cost on a link that is that local routers cost on that link. That does not mean its neighbor sees that same cost on its side.

Cost is a tie breaker. The Route-Type is the initial mechanism used for path selection such as Inter and Intra Area routes. I assume you are running single Area OSPF but cant be 100% sure just on the output provided.

Can you provide a bit more information such as a source and destination network specifically and the route you think it takes vs the route its actually taking? With output of the routing table and interface configurations.

-David

[lex18]

Here is the route table from router 5. Lets say I want to see how will it communicate with the network 195.168.1.0. I expected to do that through the router 3 as it will have cost of 10+10+10 = 30, but it chooses the way through router 4 and the cost is 50. Isn't it supposed to take the route with the lowest cost value?

[Martin L]

@lex18 

it seems that you do not getting any OSPF routes from R3; Troubleshoot link R3 to 5;  maybe OSPF is not enabled on that link?  Shut down link to R4 on r5 to see if u get any Ospf routes

Regards, ML
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[lex18]

here is the route table from router 3. The ospf is enabled

[Martin L · Accepted solution]

show ip ospf neighbors  on R5 and R3; all routers should have 2 ospf neighbors, right? check that starting at R5, I do not see any ospf routes over Serial0/0/1. if u see 2 ospf neighbors, close pt, re-open it, and check again, if still the same, attach your PT file here (in a zip format )

Regards, ML
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[Martin L]

Who is reaching who and what are your current and desire paths ?

U can attach your PT file here but it nust be in a zip format 

Regards, ML
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[M02@rt37]

Hello @lex18,

Please provide information on the source and destination networks, as well as the specific routes you expect versus the ones you observe in the routing table.