Scaling EIGRP Networks with Stub Routers
Enhanced Interior Gateway Routing Protocol (EIGRP), Cisco’s proprietary yet hugely successful and widely deployed routing protocol is known to behave disappointingly in inadequately designed networks. Cisco has improved EIGRP’s behavior dramatically with the introduction of stub routers in Cisco IOS release 12.0(7)T. However, this feature has remained a well-hidden mystery. In this IP Corner article, Ivan Pepelnjak explores the typical problems that the EIGRP stub routers help to solve, describes how the introduction of stub routers improves network stability and implements a fully redundant remote location (stub site); yet another very common design requirement that is not documented anywhere.
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