Cisco CCNP / BSCI Exam Tutorial: The Passive Interface Command And OSPF
To move the BSCI Test and turn into a CCNP, You must concentrate on the correct utilization of passive interfaces. You uncovered about passive interfaces inside your CCNA reports, but right here perfectly evaluate the basic thought and crystal clear up one particular misunderstanding with regards to passive interfaces and OSPF.
Configuring an interface as passive will nevertheless enable the interface to get routing updates, nevertheless the interface will now not http://www.thefreedictionary.com/Acheter des Followers Instagram transmit them. Even though the command itself would make you're thinking that this command will be utilized at the interface stage, that is not the situation. Underneath, effectively configure ethernet0 being a RIP passive interface.
R1(config)#router rip
R1(config-router)#passive-interface ethernet0
Ethernet0 will no more deliver RIP routing updates, but will take them.
The passive interface idea is obvious more than enough with RIP, IGRP, and EIGRP all protocols that send out routing update packets. But OSPF doesnt send routing update packets OSPF sends url point out ads. Its The lack of the passive interface command to prevent LSAs that lead several to think that passive interfaces cannot be utilized with OSPF.
While OSPF isn't going to despatched “routing updates” in the shape that RIP, IGRP, and EIGRP do, you can continue to configure an OSPF-enabled interface as passive as a way to stop OSPF visitors from exiting or moving into that interface. No OSPF adjacency can be formed if one of many interfaces associated is really a passive interface, and if you configure an OSPF-enabled interface as passive where an adjacency by now exists, the adjacency will drop almost immediately.
Let’s see that in motion. R1 and R2 have an existing OSPF adjacency more than their Ethernet interfaces. In order to lower routing targeted traffic, R1’s e0 interface is configured as passive. The adjacency drops right away.
R1(config)#router ospf one
eighteen:31:11: %OSPF-5-ADJCHG: Course of action 1, Nbr two.2.2.2 on Ethernet0 from FULL to DOWN, Neighbor Down: Interface down or detached
Realizing how to make use of the passive interface command is an important part of currently being a CCNP, and here of remaining a master networker. Good luck to you personally in the two of such pursuits!