Passive Interfaces
Router(config)#router rip
Starts the RIP routing process.
Router(config-router)#passive-interface serial0/0/0
Sets the interface as passive, meaning that routing updates will not be sent out this interface.
NOTE: For RIP, the passive-inter-face command will prevent the inter-face from sending out
routing updates but will allow the interface to receive updates.
Router(config)#router rip
Starts the RIP routing process.
Router(config-router)#passive-interface default
Sets all interfaces as passive.
TIP: The passive-interface default command is useful for Internet service provider (ISP) and large
enterprise net-works, where a distribution router may have as many as 200 interfaces.
Router(config-router)#no passive-interface fastethernet0/0
Activates the FastEthernet0/0 interface to send and receive updates.