The passive interface COMMAND disables the transmission and receipt of EIGRP hello packets on interface. Not similarly IGRP or RIP, EIGRP sends hello packets in order to form and sustain neighbor adjacency. Not having a neighbor adjacency, EIGRP doesn’t exchange routes with a neighbor. For which the passive interface command prevents the exchange of routes on the interface. Although EIGRP does not RECEIVE or send ROUTING updates on an interface configured with the passive interface command, it INCLUDES the address of the interface in routing updates sent out of other non-passive INTERFACES.

The passive interface command disables the transmission and receipt of EIGRP hello packets on interface. Not similarly IGRP or RIP, EIGRP sends hello packets in order to form and sustain neighbor adjacency. Not having a neighbor adjacency, EIGRP doesn’t exchange routes with a neighbor. For which the passive interface command prevents the exchange of routes on the interface. Although EIGRP does not receive or send routing updates on an interface configured with the passive interface command, it includes the address of the interface in routing updates sent out of other non-passive interfaces.