Posts Tagged ‘OSPF’

From: 9 Immutable Laws of Network Design – Let’s be simple, this is opinion, not law. Network design is network design and each person will have their own unique view on how to build networks. However, to say immutable laws is arrogant and only tells people you’re stuck in your ways; thus, if you stand still you’re falling behind. Read the rest of this entry »


I see a lot of confusion about the Type-4 LSA and what it does. This confusion is high in the CCNA world because little is explained about it and one might think it is useless; however, this is valuable when you’re learning or doing route redistributing into OSPF using External type-2 redistributed routes with multple ASBRs redistributing the same external routes. Read more… Read the rest of this entry »


If you’re wondering if you should use this I think you should. Having any traffic unauthenticated is just stupid and you’re asking for issues on your network with someone coming in and sniffing your traffic and discovering that you have hello messages with no or plain text authentication set. One shouldn’t have to explain the benefits; however, do understand that EIGRP has the advantage of using multiple keys in a ring that have expirations which helps rotate keys to prevent someone from getting a key that has been in use for years. OSPF does not have such a feature in IOS.