RIP metrics

digininja99

I'm playing with RIP and having trouble understanding metrics. I've built the following lab in GNS3 and sniffed traffic on the Vbox machine.



The RIP packet has the correct three networks in it but all have metrics of one. I understand the 10 network having a metric of one but shouldn't 11 have a metric of two and 192 have a metric of three?

Dieg0M

I believe the problem has something to do with the VBOX. Try sniffing traffic between R1 and the Switch and you should have the correct metrics.

AwesomeGarrett

You can run WireShark in GNS3.

digininja99

Running a capture on the port marked 10.0.0.1 shows RIP messages coming in from 10.0.0.2 with the same metrics.


That eliminates VirtualBox and anything that could affect the packets as the are leaving the GNS3 network.

Are you confirming that I'm right in thinking the metrics should all be different and so shouldn't be one?

AwesomeGarrett:
I know you can run Wireshark in GNS3, I'm building a lab to demonstrate sniffing routing traffic on host devices as part of network discovery.

Dieg0M

Yes I confirm that the metrics should all be different. This is a bug with the IOS you are using. See GNS3 • View topic - RIPv1 hop count mysterious behavior on various routers??

digininja99

Thanks, I'll go and find a router which is supported and not in the list has being affected.

PCSPreston

Yeah I would recreate the topology and then run wireshark to see what you find.

digininja99

I rebuilt it with 3745's and all is working fine now.