When I say reverse subnet mask I mean that the binary 1s and 0s of the wildcard mask are flipped compared to the subnet mask. A wildcard mask is a reverse subnet mask. This is not a subnet mask but a wildcard mask. This means that OSPF will send hello packets on the interface.īehind 192.168.23.0 you can see it says 0.0.0.255. Activate OSPF on the interface(s) that fall within this range.Advertise the networks that fall within this range in OSPF.Just like RIP the network command does two things: It works similar to RIP but it is slightly different, let me break it down for you: network 192.168.23.0 0.0.0.255 The second step is to use the network command. It doesn’t matter and if you want you can use a different number on each router. The number “1” is a process ID and you can choose any number you like. I need to use the router ospf command to get into the OSPF configuration. We’ll start with the configuration between R2 and R3: R2(config)# router ospf 1 All other links are FastEthernet (100Mbit) interfaces. Note that the link between R2 and R1 is an Ethernet (10Mbit) link. Having said that, let’s configure OSPF! This is the topology I will use: If you have no idea what OSPF is or if you are a little fuzzy, I recommend you to read my Introduction to OSPF first before continuing. CCNA students need to understand how OSPF works but also how to configure it.
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