Routing update usually updates the nearby routers about the current configuration of a router. There is a way in order not to transmit updates about the status of the router by using passive interface. Passive interface means that the interface will receive the update from other neighboring routers, but will not transmit its routing table configuration.
To apply passive interface use the command:
(config)#router rip // do it on the hub router to be a passive interface
(config-router)#passive-interface
To cancel passive interface then:
(config-router)#no passive-interface
It is possible to send updates to only a specific router neighbor. To do this, the hub router must be set in the passive interface first.
To do this type the command:
(config)#router rip
(config-router)#neighbor
To verify this, type the command #show ip route
To apply passive interface use the command:
(config)#router rip // do it on the hub router to be a passive interface
(config-router)#passive-interface
To cancel passive interface then:
(config-router)#no passive-interface
It is possible to send updates to only a specific router neighbor. To do this, the hub router must be set in the passive interface first.
To do this type the command:
(config)#router rip
(config-router)#neighbor
To verify this, type the command #show ip route
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