As stated earlier in this module, 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 discover neighbours dynamically and establish network relationships. This is desired on interfaces that are actually connected to physical media, such as Ethernet and Serial interfaces. However, this default behaviour also results in an unnecessary waste of router resources on logical interfaces, such as Loopback interfaces, that will never have any other device connected to them with which the router could ever establish an EIGRP neighbour . . .
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