CCIE Training

The latest, highly technical post from Petr on OSPF!

Learn how to determine the exact K values from an EIGRP peer, even if we don't have console access to the neighbor...

OSPF FA Overview This post is dedicated to one “esoteric” OSPF external route filtering method based on hiding OSPF Forwarding Address. Recall the meaning of OSPF FA. This is a special field used on OSPF type 5 and 7 LSAs to convey the information of the “external route source”. The purpose of FA is to optimize [...]

Challenge solutions. Comments / submitted solutions are now available on the original post.

Followup to "Have you seen my Router ID?", dissecting a task from a strategy / knowledge point of view.

Challenge post on OSPF configuration.

The feature we are going to talk about today may look a bit convoluted, but it demonstrates core OSPF behavior: combining link-state and distance-vector behaviors. The command capability transit was introduced in IOS 12.3T and is on by default. However, the description is rather confusing and does not explain the underlying mechanics. We are going [...]

We have added a lesson to the 10-day ATCOD on EIGRP for IPv6. This is a key CCIE R/S Version 4.x topic. Enjoy!

One of the most popular series on this blog site is the Redistribution series by Petr Lapukhov. I wanted to share a document that helped one of my recent, incredibly dedicated, 12 Day Bootcamp students, Sean Coetzee. Thanks for sharing Sean! Redistributing Routing Protocols http://www.cisco.com/application/pdf/paws/8606/redist.pdf

If you are interested in Part 1 of this blog series – click here. Question 2 of 105 Given the topology and configurations shown in the exhibits. Which devices will receive EIGRP Query packets if R1 loses its route information for the 10.10.10.0/24 prefix? a) None of the devices b) R2, R3, R4, R5, R6, R7 c) R2, R3, R6, [...]