Static and Dynamic Router Integration

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Static and Dynamic Router Integration

Figure 5.26 illustrates a possible scenario in which a network consists of static routers and dynamic routers.

The best way to picture the integration of these two types of routers in an environment is to think of static routers as being dumb as a wall and dynamic routers as being a particularly chatty person. Think about it. Walls don’t talk, thankfully, and no matter how much you talk to a wall, it’s not going to respond. Now imagine a very chatty person standing in front of a wall, communicating a mile a minute about everything under the sun. The wall, no matter what incentives this person provides or promises, will simply return silence. Now extend this example to Figure 5.26, which illustrates the default route tables for each of the routers.

Follow the path of a packet originating from the 131.107.32.0 network as it tries to reach the 131.107.128.0 network. By remembering our earlier example, it is fairly clear that router A will simply drop any packets destined for the 128 network. So, that fails, but you have come to expect that from static routers.

Therefore, you add static route table entries to router A. After you add the route table entries, the packet is again resent. Things seem to be running smoothly until router B gets hold of the packet and drops it. Oops, forgot! You must make static route table entries on all static routers in the environment. So, now, you add the appropriate route table entries on the static routers and the packet is ready to be sent again. Figure 5.26 illustrates the new route tables that have been created.

The packet is resent and makes it to Router B. Router B knows to send all packets destined for the 131.107.128.0 network to 131.107.96.1 and does so. However, the process of sending the packet does not result in router C having any idea where this packet comes from; the packet just lands on router C’s doorstep. router C moves the packet to the 131.107.128.0 network. The machine that receives the packet tries to send a response to network 131.107.32.0 and sends its response to router C. Even though router C is a new RIP-enabled router, it has received no information about a 131.107.32.0 network from any of its friends. The packet gets dropped.

So, when combining static and dynamic routers on a network, you have to enter static entries into the route table of your dynamic routers. Elegant, no; necessary, yes. To make matters worse, some dynamic routers do not propagate static route table entries, requiring all dynamic routers to have static route table entries added to them. Figure 5.27 illustrates the final route tables necessary to fulfill the communications requirements on the network.

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