From the course: Cisco Certified Network Associate (CCNA) v1.1 (200-301) Cert Prep

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OSPFv2 configuration

OSPFv2 configuration

From the course: Cisco Certified Network Associate (CCNA) v1.1 (200-301) Cert Prep

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OSPFv2 configuration

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(soft music) - [Instructor] In this video, we want to configure OSPF version 2 to route IPv4 networks. Before getting into the lab environment though, we need to define a wild card mask because that's going to be part of our configuration. Now, a wild card mask is really the inverse of a subnet mask. You might recall that a subnet mask typically has a grouping of ones followed by a grouping of zeros making up this 32 bit subnet mask. Well, a wild card mask is the opposite of that. We take the ones from a subnet mask, we make them all zeros, and we take the zeros from a subnet mask and we make them all one. And that gives us the wild card mask corresponding to that subnet mask. But there's a much easier way to calculate that. What we can do is simply take 255.255.255.255 and subtract from that the subnet mask. And that's going to give us the resulting wild card mask. We subtract the value in octet one of the subnet mask from 255. Then we do the same things for octets two, three, and…

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