Full Mesh

Full mesh (Figure 10-14) becomes a required design only when each connection is truly a peer to other connections and traffic must flow equally to all spokes. A sample application might be IP telephony. If there are a large number of calls between sites, in addition to the rest of the data traffic, a full mesh can be appropriate.

Figure 10-14. Full-Mesh IPsec

Figure 10-14. Full-Mesh IPsec

Full mesh is clearly the least scalable, most expensive, and most difficult topology from a configuration standpoint. Dynamic routing and digital certificates should be considered requirements for any full-mesh IPsec network greater than approximately five peers. From a hardware standpoint, each site must have the same capabilities in its IPsec gateways. As the number of sites expands, the requirements on the routing protocol grow just like in any other fully meshed network.

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