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EIGRP is an important part of real-world networking as well as being a major topic on the 642-901 CCNP BSCI exam. As with any networking topic, before you try to master intermediate and advanced skills, you must master the fundamentals. It doesn’t get any more fundamental than the EIGRP adjacency process – and it doesn’t get any more important, because without that adjacency, we don’t have an EIGRP deployment!

In today’s CCNP tutorial, we’ll work with R1 and R2, two Cisco routers communicating over a serial interface. EIGRP is already running on R2’s serial interface, but was just enabled on R1’s serial interface. The EIGRP adjacency process begins with R1 sending an EIGRP Hello packet to the multicast address 224.0.0.10 in an attempt to find potential neighbors.

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Your BSCI exam may well be the most challenging of the four exams you must pass to become a CCNP, so you have to have the details of every protocol on the exam mastered! Today, we’ll look at the passive-interface command as it relates to OSPF.

Passive interfaces accept routing updates, but do not send them. Regarding OSPF, even though OSPF does not sent “routing updates” in the form that RIP, IGRP, and EIGRP do, you can still configure an OSPF-enabled interface as passive in order to prevent OSPF traffic from exiting that interface. No OSPF adjacency can be formed if one of the interfaces involved is a passive interface, and if you configure an OSPF-enabled interface as passive where an adjacency already exists, the adjacency will drop almost immediately.

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