OSPF Basics - passive interface
passive interface or
passive enable command in OSPF stops an adjacency forming over a specific
router interface. An interface that has been set to passive still has its IP address injected into the OSPF domain
and is seen as a STUB network.
This allows interface addresses to be advertised into the OSPF domain but also stops LSA generation / flooding from occurring for interfaces where an adjacency is not expected to be formed.
Differences between IOS XE and IOS XR configuration commands:
router ospf 23 passive interface default # enable globally passive interface g1 # enable for specific interface no passive interface g1 # disable for specific interface
router ospf 23 passive enable # enable globally (all areas / interfaces area 11 passive enable # enable at area level (interfaces within the area) interface <int-id> passive enable # enable for specific interface passive disable # disable for specific interface