OK so clearly I haven’t been updating a lot lately due to my very busy situation. I’m sorry for that but my former colleague Henri keeps nagging me for an update so I decided to write on some interesting tidbits
OSPF: Anatomy of a routing protocol
To become a CCIE you need detailed knowledge of OSPF. Most candidates will have read the TCP/IP Volumes by Doyle and maybe even the RFC written by J Moy. This book is also written by J Moy and it is
MPLS troubleshooting scenario
I’m in final preparation for my second attempt and I have been doing a lot of troubleshooting scenarios lately. I created a MPLS topology in GNS3 and sent it to my friend Darren for testing. He is taking his lab
Route redistribution – filtering and mitigating loops
This post is about route redistribution and the different filtering techniques we have available in our toolbelt. This post requires that you have a basic understanding of route redistribution. For some good posts look at Petr Lapukhovs posts at INE.
OSPF magic – Make interarea routes become intraarea
This is a follow up post to my last OSPF post about repairing area 0. In the comments section Ray asked me what we can do if we have a scenario where we have another area that is discontigous. In
Repairing a discontigous area 0 in OSPF
First start by looking at the diagram above. This is a scenario I ran into while doing my mock lab. It is pretty obvious that we will have issues with OSPF since area 0 is discontigous. You should be able
How well do you really know OSPF?
OSPF is by far the most complicated IGP on the RS lab if we go in to the details of the protocol and the loop prevention mechanisms. While doing some labs this week I ran in to some interesting issues.
OSPF Vol1 finished
Finished OSPF Vol1 tonight. I should know pretty much everything about OSPF by now. Here are some advice that I think is good when handling OSPF. show ip ospf data self-originate – Will show what LSAs the local router is
Fun with OSPF
Did some OSPF labbing yesterday. Ran into some interesting stuff. Imagine that you are running a frame-relay network which is hub and spoke. All routers are using their main interface for communication. The hub router has the static frame relay
Some comments after doing Vol3 lab 7
Just did this lab earlier today and wanted to post some stuff that might help people. I’ve posted earlier on how to quickly find out IP-addresses and masks with different commands. I played around a little more today and this