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Purdue University
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webmaster: W. David Laverell


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Hands-On Networking: Experiment 17.4 (An Emulab Approach) Home > Student > Experiments > Emulab > 17.4

Experiment 17.4 - Configure and Run OSPF Software on an Emulab

This never looked easy, and it turned out to be rather difficult. The key to my solution was in discovering the other options to the rtproto command. Static is typical, Manual was introduced in 17.3, but the new one is Session which sets up routing using OSPF. Great! Just what we wanted. Well, not quite because if you run an experiment with this type of routing and ssh to a node, you discover that Emulab uses gated and makes the control network the backbone! No doubt that everything is connected to the backbone, but this is not what we want. It does mark the backbone as passive, however, and that turns out to be the key. Here is a sample gated.conf file which corresponds to making the control network the backbone:


smux off;
rip off;
ospf on {
	backbone {
		interface eth0 { passive; };
	};
	area 0.0.0.2 {
		authtype none;
		interface eth2 { priority 1; };
		interface eth4 { priority 1; };
	};
};

I tried various schemes but eventually I changed the control network, the backbone, to area 5 and set up the rest of the interfaces as presented in Hands-On. Eliminating my mistakes took some time, but eventually I was merrily pinging all over the network.



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