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You are here: Home / ICND2 / Day 36 – EIGRP / Day 36 Tasks / Understanding the Use of the EIGRP Router ID

Understanding the Use of the EIGRP Router ID

Unlike OSPF, which uses the router ID (RID) to identify the OSPF neighbour, the primary use of the EIGRP RID is to prevent routing loops. The RID is used to identify the originating router for external routes. If an external route is received with the same RID as the local router, the route is discarded. This feature is designed to reduce the possibility of routing loops in networks where route redistribution is being performed on more than one ASBR.

When determining the RID, EIGRP will select the highest IP address that is configured on the router. If Loopback interfaces are . . .

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