I've always been fascinated by OSPF. I remember back in the day when I felt that I really know OSPF inside out until I went for a job interview where several interviewers grilled me on OSPF and I was like you know what? I really have to go back and dig as deep as possible into OSPF (and no, I did not get that job...).OSPF has many features and quirks, its flexible but also has many limitations, it's scalable but also can cause major headaches in large scale networks. In this post, I will be focusing on LSA Type 4 just because this a really interesting LSA. It is often misunderstood, misrepresented and as I will show towards the end, in
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