CCNP Routing and Switching ROUTE 300-101 Official Cert Guide

Single-Multihomed

A single-multihomed topology means a single link per ISP, but multiple (at least two) ISPs. Figure 13-13 shows a couple of single-multihomed designs, each with two ISPs.

Figure 13-13 Single-Multihomed Designs

The single-multihomed design has some similarities with both the single-homed and dual-homed designs previously seen in this section. The single-multihomed design on the top of the figure, which uses a single router, acts like the single-homed design for default routes in the enterprise. This design can flood a default route throughout the enterprise, drawing traffic to that one router, because only one router connects ...