Cisco CCNP / BSCI Exam Tutorial: The Passive Interface Command And OSPF
To move the BSCI Examination and turn into a CCNP, You will need to know about the appropriate usage of passive interfaces. You figured out about passive interfaces in the CCNA studies, but here nicely assessment The fundamental concept and very clear up one particular false impression with regards to passive interfaces and OSPF.
Configuring an interface as passive will however enable the interface to obtain routing updates, but the interface will not transmit them. Even though the command itself would make you think that this command are going to be applied with the interface stage, that's not the case. Below, effectively configure ethernet0 for a RIP passive interface.
R1(config)#router rip
R1(config-router)#passive-interface ethernet0
Ethernet0 will not mail RIP routing updates, but will take them.
The passive interface idea is evident more than enough with RIP, IGRP, and EIGRP all protocols that ship routing update packets. But OSPF doesnt mail routing update packets OSPF sends hyperlink condition commercials. Its the inability of the passive interface command to halt LSAs that guide several to think that passive interfaces can not be utilized with OSPF.
Although OSPF doesn't despatched “routing updates” in the shape that RIP, IGRP, and EIGRP do, it is possible to nevertheless configure an OSPF-enabled interface as passive so that you can avoid OSPF site visitors from exiting or getting into that interface. No OSPF adjacency may be formed if among the interfaces involved is really a passive interface, and if you configure an OSPF-enabled interface as Acheter des Followers Instagram passive the place an adjacency already exists, the adjacency will drop shortly.
Let’s see that in motion. R1 http://www.bbc.co.uk/search?q=Acheter des Followers Instagram and R2 have an existing OSPF adjacency over their Ethernet interfaces. In an effort to minimize routing visitors, R1’s e0 interface is configured as passive. The adjacency drops without delay.
R1(config)#router ospf 1
eighteen:31:11: %OSPF-five-ADJCHG: Process one, Nbr 2.2.two.two on Ethernet0 from Whole to DOWN, Neighbor Down: Interface down or detached
Recognizing ways to make use of the passive interface command is a vital Portion of being a CCNP, and of becoming a master networker. Good luck to you personally in both of those of these pursuits!