Passive Interface is utilized in routing protocols to disable sending updates out from a particular interface. This holds true for OSPF, EIGRP and RIP.
In OSPF, Passive interface is considerably like EIGRP the place Hiya packets are suppressed along with neighbor relationship.
OSPF Passive Interface
Passive interface in OSPF permits the related community of an interface to be marketed all through the OSPF area, however cease the sending of good day packets.
If no good day packets are despatched out of an interface, then an adjacency can’t be shaped and if we configure an OSPF-enabled interface as passive the place an adjacency already exists, the adjacency will drop.
OSPF Passive Interface Configuration
Beneath configuration allows passive interface on interface FastEthernet 0/0 and shortly drops the neighborship since no Hiya is exchanged.
R1(config)#router ospf 1
R1(config-router)#passive-interface FastEthernet0/0
R1(config-router)#
16:12:11: %OSPF-5-ADJCHG: Course of 1, Nbr 2.2.2.2 on FastEthernet0/0 from FULL to DOWN, Neighbor Down: Interface down or indifferent
At instances, we could require {that a} Router mustn’t have neighborship or ship good day on any of the interfaces.
On this case, we not a must configure every interface as passive. IOS model 12.0 onwards, we are able to now set all interfaces on a router as passive for a given protocol with the passive-interface default command.
We will then configure every interface not required to be passive with the “no passive-interface” command.
R3(config)#router ospf 1
R3(config-router)#passive-interface default
To set the interfaces again to their default, simply use the no passive-interface default command.
R3(config-router)#no passive-interface default
Proceed Studying:
Learn how to configure OSPF Digital Hyperlink?
OSPF Exterior Route Filtering not occurring
OSPF Exterior Route Summarization not occurring
