As shown in the exhibit, the 10.10/16 prefix is redistributed into OSPF through R2 and R5.
R2 is advertising the prefix with a Type 1 metric of 100 and R5 is advertising the prefix with a Type 2 metric of 10.
What is the preferred path to reach 10.10/16 from R6?
A.
R6-R5
B.
R6-R4-R5
C.
R6-R4-R5-R2
D.
R6-R4-R3-R2
I think C is is correct. Type says this is the cost 10.10/16 while type says this is the cost from the ASBR to 10.10/16 so add this to the overall cost.Cost from R4-R5-10.10/16 = 12; cost from R4-R3-R2 = 110.
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D is the correct answer, E1 routes are proffered over E2 routes even if the metric is lower. the value metric does add any value in route path selection in the above scenario.
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First, let’s review the order of the OSPF path selection process. Regardless of a route’s metric or administrative distance, OSPF will choose routes in the following order:
Intra-Area (O)
Inter-Area (O IA)
External Type 1 (E1)
External Type 2 (E2)
NSSA Type 1 (N1)
NSSA Type 2 (N2)
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