What are LSA Type 4 for?
I am wondering what LSA type 4 are for?
I just dont get it althought there are a lot of explanations.
Why do we need an LSA that is generated by an "ABR" and advertises an "ASBR-summary" routes? We have Type 5 for advertising external routes and we have Type 3 for advertising networks between areas.
Maybe anyone has a good simple explanation that even I understand .
Thanks in advance!