I know that OSPF internal route has a preference of 10 and an external route of 150 in Juniper.
However, I am unable to find the document stating the path selection priority between Intra-area route and Inter-area route.
Could you please tell me the page with this content?
Or Could you please tell me more about this?
Thank you for reading me.
Hi seunghyun lee,
I hope you are doing great!
I believe this DOC will clear all the questions you have, if not please let me know :
If this solves your problem, please mark this post as "Accepted Solution" Pura vida 😄
Pablo Restrepo -
Hi Seunghyun Lee,
This is always a confusing topic at some point when we are learning it. I have this very useful link with some examples and how cost will be taken into account when selecting routes, also it is included the rules for inter-area (different areas) or intra-area (same area) route selection, it basically depends on where the destination is located and the type of LSA for that prefix.
> intra area - a route to a subnet or network inside the same area as the router. LSA type 1 and 2 fall in here / router and network LSAs
> inter area - a route to a subnet in an area of which the router is not a part. LSA tpe 3 falls in here / summary LSAs
I hope this link helps you understanding more this behavior:
OSPF inter-area and intra-area routing rules
it is not possible to select Inter Area route over Intra Area route or External routes over inter/intra area route for an OSPF process.
RFC2328, Section 11 explains the order of preference which is:
1) Intra Area
2) Inter Area
3) External routes E1
4) External routes E2
Hope it helps, and good luck comprehending the material, feel free to ask more if you need to, I will try to help as needed.
Thank both of you for all your help on this topic.
My curiosity has been solved.
I am sorry that I have to choose only one answer.
I would like to thank you again for your great answers.