Users report issues with reachability between areas as soon as an engineer configured summary routes between areas in a multiple area OSPF autonomous system. Which action resolves the issue?
A.
Configure the area range command on the ASBR.
B.
Configure the summary-address command on the ASBR.
C.
Configure the summary-address command on the ABR.
D is correct answer
The area range command is used only with area border routers (ABRs). It is used to consolidate or summarize routes for an area. The result is that a single summary route is advertised to other areas by the ABR. Routing information is condensed at area boundaries. External to the area, a single route is advertised for each address range.
All answers are wrong. A and C have invalid syntax. B is for ASBRs, not relevant here. D is the only command that makes sense, but that is the command that was already used to configure the summarization.
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