passive-interface confusion

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Jul 28th, 2008
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Some people get confused with the passive-interface command in EIGRP and RIP since both protocols are distance vector. Under RIP this command only restricts outgoing advertisements only but does not stop the advertise and receiving of updates on the interface. Under EIGRP the passive-interface command stops both outgoing and incoming routing updates, since the effect of the command causes the router to stop sending and receiving hello packets over an interface.

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Giuseppe Larosa Mon, 07/28/2008 - 09:39
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Hello Francisco,

the effect on RIP is to stop sending advertisements but allows to receive them because there is no neighbor state machine and no hello messages.

EIGRP has a neighbor state machine similar to OSPF and IS-IS (link state ) so it will not accept updates from a neighbor with whom it is not exchanging hello packets with matching parameters

EIGRP is regarded as an hybrid protocol for this and other aspects


Hope to help

Giuseppe

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