The April IP Corner article describes EIGRP stub routers, a feature that can significantly improve the stability of large EIGRP networks. I'm describing the theory behind EIGRP stub routers, how they reduce EIGRP traffic and decrease the convergence times in large hub-and-spoke networks as well as how you use undocumented IOS features to build fully redundant dual router stub sites.
Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.
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