Which Router Should Be Chosen as the Designated Router

In Figure 5-6, the 2500 router for Building A, which is connected to the San Francisco campus via a hub, would be a reasonable choice as the designated router. Although it is small, size is not as important as fault tolerance in this situation.

Figure 5-6 The Designated Router

Figure 5-6 The Designated Router

Building A Building B Building C

2500 2500 2500

Building A Building B Building C

2500 2500 2500

Because there are not many other routers on the segment, the number of LSAs and adjacencies that this router would have to record is small.

The larger 7200 Cisco router, which connects the building routers to the campus backbone, acts as the centralized router; therefore, the 7200 Cisco router makes sense as the router in charge of the connectivity for the FDDI segment. It would be a mistake to make the 7200 the designated router for both networks because this would increase the demand for resources and also would centralize all the responsibility on one router.

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