Cisco CCNP / BSCI Test Tutorial: The Passive Interface Command And OSPF
To go the BSCI Test and become a CCNP, You must know about the proper use of passive interfaces. You learned about passive interfaces in your CCNA scientific tests, but in this article perfectly critique the basic principle and crystal clear up just one misunderstanding relating to passive interfaces and OSPF.
Configuring an interface as passive will nonetheless enable the interface to acquire routing updates, even so the interface will no longer transmit them. Though the command alone would make you think that this command will be applied on the interface level, that is not the case. Beneath, well configure ethernet0 as a RIP passive interface.
R1(config)#router rip
R1(config-router)#passive-interface ethernet0
Ethernet0 will no more send RIP routing updates, but will take them.
The passive interface strategy is obvious ample with RIP, IGRP, and EIGRP all protocols that ship routing update read more packets. But OSPF doesnt send routing update packets OSPF sends website link point out ads. Its the inability with the passive interface command to halt LSAs that direct quite a few to are convinced passive interfaces can not be utilized with OSPF.
Although OSPF does not sent “routing updates” in the shape that RIP, IGRP, and EIGRP do, you can continue to configure an OSPF-enabled interface as passive in order to reduce OSPF website traffic from exiting or coming into that interface. No OSPF adjacency might be shaped if one of many interfaces associated is actually a passive interface, and if you configure an OSPF-enabled interface as passive wherever an adjacency previously exists, the adjacency will fall shortly.
Let’s see that in action. R1 and R2 have an current OSPF adjacency about their Ethernet interfaces. In an effort to decrease routing visitors, R1’s e0 interface is configured as passive. The adjacency drops straight away.
R1(config)#router ospf 1
18:31:11: %OSPF-5-ADJCHG: Approach 1, Nbr two.2.2.two on Ethernet0 from Total to DOWN, Neighbor Down: http://www.bbc.co.uk/search?q=Acheter des Followers Instagram Interface down or detached
Recognizing the way to utilize the passive interface command is a significant Section of staying a CCNP, and of getting a master networker. Great luck for you in both equally of those pursuits!
