![]() – Int er-area route between two non-backbone areas must pass through the backbone area. ![]() – ABRs do not take into account in SPF calculations LSAs received from non-backbone areas. – ABR’s advertise only intra-area routes from non-backbone area to the backbone area and advertise intra-area and inter-area routes from backbone area to a non-backbone area. – Int ra-area routing to a destination inside a non-backbone area will take the shortest path without traversing the backbone area.- Int ra-area routing to a destination inside a backbone area will take the shortest path without traversing a non-backbone area. – Int ra-area routes are always preferred over int er-area ones. The following lab focuses on intra-area and inter-area route selection process.įor the sake of clarity, I put the final conclusions first, wrapped in a table form, with some explanations to ponder upon, followed by the different lab cases used to check OSPF route selection rules.įor each case, I used interface costs and states to illustrate OSPF selection rules in action.
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