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Passive Interface command Behavior in RIP, EIGRP & OSPF

February 9, 2016

RIP
In RIP passive-interface command will disable sending multicast updates via a specific interface but will allow listening to incoming updates from other RIP speaking neighbors.
R1# router rip
R1# passive-interface fa0/0

Command to see list of passive-interfaces
R1# show ip protocols

EIGRP
When an interface is passive, EIGRP quits sending any outgoing hello packets, so the router can not form any neighbor relationship via passive interface. This behavior stops both outgoing and incoming routing updates. However, EIGRP still advertises the connected subnets if matched with an EIGRP network command.
R1# router eigrp 1
R1# passive-interface fa0/0

Command to see list of passive-interfaces
R1# show ip protocols

OSPF
It works just like it works with EIGRP. When a router configures an interface as passive to OSPF, OSPF stops sending outgoing hello packets, so the router can not form any neighbor relationship via the passive interface. This behavior stops both outgoing and incoming routing updates. However, OSPF still advertises the connected subnets if matched with an OSPF network command.
R1# router ospf 3
R1# passive-interface fa0/0
Command to see list of passive-interfaces
R1# show ip protocols

 

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