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You are here: Home / ROUTE / Module 2 / EIGRP – Understanding Passive Interfaces

EIGRP – Understanding Passive Interfaces

As stated earlier in this chapter, when EIGRP is enabled for a network, the router begins to send out Hello packets on all interfaces that fall within the specified network range. This allows EIGRP to dynamically discover neighbors and establish network relationships. This is desired on interfaces that are actually connected to physical media, e.g. Ethernet and Serial interfaces. However, this default behavior also results in an unnecessary waste of route resources on logical interfaces, such as Loopback interfaces, that will never have any other device connected to them that the router could ever establish an EIGRP neighbor relationship . . .

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