Hi,
A point-to-point link type is included twice in a Router-LSA.
1) As Link Type = 1 (p2p), with neighboring router's RID as Link ID. This
happens when the adjacency status is FULL.
2) As Link Type = 3 (stub), with IP subnet address as Link ID. This happens
when the interface state is point-to-point, regardless of the status of
adjacency.
I found out that if a point-to-point link is used as passive-interface, then
adjacency will not be formed. Hence, link type = 1 advertizement will be
absent. However, a link type = 3 advertizement of such a link makes it
reachable.
Please share more examples where it helps to advertize a p2p link type in two
ways. My intention is to understand the need for having two types of
advertizements for the same p2p link.
Thank you.
Best wishes
Suketu Soni
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