OSPF Authentication Types – Part 1
There are three types of OSPF authentication. Type 1 – no authenticationType 2 – clear textType 3 – cryptographic (MD5 or SHA) Lets …
Should you run OSPF over DMVPN?
You may have heard that you should not run OSPF over DMVPN but do you actually know why? There is actually no technical reason why you cannot run OSPF …
How to read and understand the OSPF Database
Just a quick post to point you all over to a fantastic resource on How to Read and Understand the OSPF Database Written by Alfred Lumbis who I believe …
OSPF Anatomy of an Internet Routing Protocol
Following a recommendation from Brian Dennis on a recent INE Vseminar. I decided to purchase a book every network engineer should read. OSPF Anatomy …
CCIE Troubleshooting OSPF Hello Mismatch
Whilst reading the RFC for OSPFv2 – RFC 2328 I noticed an interesting sentence in section 10.5 about Receiving Hello Packets. The generic input …
OSPF cost calculation
How does OSPF work out the interface cost? By default the ospf cost calculation is based on a reference bandwidth of 100Mb The calculation is …
OSPF LSA Types Cisco for IPv4 Explained
This post will explain the Cisco OSPF LSA Types hopefully in an easy to understand format. These are my study notes for the CCIE R&S Lab exam. The …