Saturday, October 17, 2020

OSPFv2 LSA Type 3 & 4

Hello everyone!

Almost any Network Engineer knows what LSA Type 3 and 4 are used for:

LSA 3 = Inter-area to OSPF route

LSA 4 = Inter-area to ASBR (who has routes to external routing domain)

My question is:

why do we really need LSA Type 4 to describe Inter-area route to ASBR?

why we couldn't use LSA Type 3 with /32 netmask for it?



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