Your OSPF network includes an NSSA.Which LSA type is injected into the NSSA by the ASBR?
A.
Type 3
B.
Type 5
C.
Type 7
D.
Type 9
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Hi,
How come ASBR inject a type 3 LSA inside the NSSA . I am confused as it should be Type 7 . is there is any tricks in this question ?
Regards
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Ref: https://learningnetwork.cisco.com/thread/13230
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What LSA’s are injected into a nssa?
ABRs are identified as the router the is in both Area 0 and any other Area. The ASBR is identified as the router that connect any OSPF Area with an outside autonomous system. Attached please find a diagram of different OSPF areas and the LSA types allowed in these areas. You will see the placement of ABR and ASBR within the OSPF domain. Also below is a very good description of the different LSA types I found while studying for my CCIE written. Hope this helps explain the LSA types a bit better.
+ LSA 1 (Router LSA)
Generated by all routers in an area to describe their directly attached links (Intra-area routes). These do not leave the area.
+ LSA 2 (Network LSA)
Generated by the DR of a broadcast or Nonbroadcast segment to describe the neighbors connected to the segment. These do not leave the area.
+ LSA 3 (Summary LSA)
Generated by the ABR to describe a route to neighbors outside the area. (Inter-area routes)
+ LSA 4 (Summary LSA)
Generated by the ABR to describe a route to an ASBR to neighbors outside the area.
+ LSA 5 (External LSA)
Generated by ASBR to describe routes redistributed into the area. These routes appear as E1 or E2 in the routing table. E2 (default) uses a static cost throughout the OSPF domain as it only takes the cost into account that is reported at redistribution. E1 uses a cumulative cost of the cost reported into the OSPF domain at redistribution plus the local cost to the ASBR.
+ LSA 6 (Multicast LSA)
Not supported on Cisco routers.
+ LSA 7 (NSSA External LSA)
Generated by an ASBR inside a NSSA to describe routes redistributed into the NSSA. LSA 7 is translated into LSA 5 as it leaves the NSSA. These routes appear as N1 or N2 in the ip routing table inside the NSSA. Much like LSA 5, N2 is a static cost while N1 is a cumulative cost that includes the cost upto the ASBR.
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I think the correct answers is type 7.
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Yes, the correct is C)
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No, i think that correct answer A. quiestion about LSA INTO NSSA, not FROM NSSA. into nssa type3, from type 5, type 7 only in areaNSSA
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I read question not right, sorry, read like ABR,not ASBR.
ASBR generates type 7 LSA. correct C
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C for sure
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It should be Type 7 , Correct answer should be C
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Correct answer is TYPE 7 as it asked route advertised by ASBR in NSSA. This was one of exam question.
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