Cisco CCNP / BSCI Exam Tutorial: The Passive Interface Command And OSPF
To pass the BSCI Test and become a CCNP, You must be aware of the right usage of passive interfaces. You acquired about passive interfaces inside your CCNA studies, but right here nicely assessment The essential idea and crystal clear up 1 false impression concerning passive interfaces and OSPF.
Configuring an interface as passive will however allow the interface to obtain routing updates, but the interface will no more transmit them. While the command alone would make you think this command will be applied for the interface level, that is not the case. Underneath, perfectly configure ethernet0 like a RIP passive interface.
R1(config)#router rip
R1(config-router)#passive-interface ethernet0
Ethernet0 will not ship RIP routing updates, but will acknowledge them.
The passive interface concept is clear sufficient with RIP, IGRP, and EIGRP all protocols that mail routing update packets. But OSPF doesnt mail routing update packets OSPF sends link point out adverts. Its The lack in the passive interface command to prevent LSAs that lead many to believe that passive interfaces can not be used with OSPF.
While OSPF won't despatched “routing updates” in the form that RIP, IGRP, and EIGRP do, you can even http://www.bbc.co.uk/search?q=Acheter des Followers Instagram now configure an OSPF-enabled interface as passive so as to reduce OSPF targeted traffic from exiting or moving into that interface. No OSPF adjacency can be fashioned if one of several interfaces involved is usually a passive interface, and if you configure an OSPF-enabled interface as passive wherever an adjacency now exists, the adjacency will drop presently.
Enable’s see that in action. R1 and R2 have an existing OSPF adjacency above their Ethernet interfaces. In an effort to reduce routing traffic, R1’s e0 interface is configured as passive. The adjacency drops instantly.
R1(config)#router ospf one
eighteen:31:11: %OSPF-five-ADJCHG: Method one, Nbr 2.two.two.2 on Ethernet0 from Entire to Acheter des Followers Instagram DOWN, Neighbor Down: Interface down or detached
Being aware of the way to make use of the passive interface command is an important part of remaining a CCNP, and of staying a grasp networker. Fantastic luck for you in both of these pursuits!