NHRP
One possible solution to the Layer 3 meshing problem is the Next Hop Resolution Protocol (NHRP). NHRP is technically a routing protocol rather than a new Layer 2/3 switching mechanism. Figure 9-1 provides an example network for discussion.
Figure 9-1. Full Mesh Neighbors
Now, as you know from Chapter 3, the full mesh design in Figure 9-1 results in 15=>6(6-1)/2 paths through the network. Suppose that you want to reduce the paths through the network by making it a hub and spoke design. It could look like the one illustrated in Figure 9-2.
Figure 9-2. Hub and Spoke Network Design
The real difficulty with this design (other than the ...
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