In Chapter 2, passive interfaces were described as interfaces over which no routing updates are sent. In Cisco IOS software, an interface is configured as passive by using the passive-interface [name] router configuration command. If there are multiple interfaces on the router that need to be configured as passive, the passive-interface default router configuration command should be used. This command configures all interfaces that fall within the configured network range on the router to be passive. Interfaces on which adjacencies or neighbor relationships should be allowed can then be configured using the passive . . .
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