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Hans van Kranenburg 2015-06-06 20:59:28 +02:00
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@ -21,7 +21,7 @@ Each of the four routers is shown as a little "card" with information on it, whi
If the network is a "stub", it's like a dead end road, and we expect that the network contains end hosts (like servers and workstations), but no other routers. If the network is not a stub, we consider it a network where other routers are present, and usually no end hosts.
So what's different between the network drawings of the Birdhouse Factory that we've seen in the previous tutorials? On the last page, we learned that sysadmin Carl had designed the whole network on paper first, and then had to program all routes to other networks into each router in the network. The image above looks like the complete opposite. We have four routers, and each of them only knows about it's directly connected subnets, and has no idea at all about the existence of the other three routers. This seems strange, but it's an ideal starting point for a dynamic routing protocol like OSPF. The topology of an OSPF network is not laid out in advance. The network completely discovers itself "on the go".
So what's different between the network drawings of the Birdhouse Factory that we've seen in the previous tutorials? On the last page, we learned that sysadmin Carl had designed the whole network on paper first, and then had to program all routes to other networks into each router in the network. The image above looks like the complete opposite. We have four routers, and each of them only knows about its directly connected subnets, and has no idea at all about the existence of the other three routers. This seems strange, but it's an ideal starting point for a dynamic routing protocol like OSPF. The topology of an OSPF network is not laid out in advance. The network completely discovers itself "on the go".
## Step two: activating OSPF, discovering network topology