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Regarding OSPF NSSA

Regarding OSPF NSSA

Sunuk_Kim
New Contributor

Hello everyone 

I know that there is no inforamtion about LSA type 5 except lsa type7 in ASBR’s NSSA.

However, when I check the OSPF LSDB, AS External LSAs information was seen as below.

        AS External LSAs
Link State ID   Adv Router      Seq#         Age Chksum  Tag
-------------------------------------------------------------
5.5.5.5         3.3.3.3         0xffffffff80000001  550  0x7e1e   0

        Router LSAs for area 0.0.0.1
Link State ID   Adv Router      Seq#         Age Chksum  #Links
-------------------------------------------------------------
2.2.2.2         2.2.2.2         0xffffffff80000005  553  0xb00a  4
3.3.3.3         3.3.3.3         0xffffffff80000002  546  0x 58b  2
4.4.4.4         4.4.4.4         0xffffffff80000003 1183  0x176a  2

        Summary LSAs for area 0.0.0.1
Link State ID   Adv Router      Seq#         Age Chksum
-------------------------------------------------------------
12.12.12.0      2.2.2.2         0xffffffff80000001 1333  0xbb75

        AS External Type 7 LSAs for area 0.0.0.1
Link State ID   Adv Router      Seq#         Age Chksum  Tag
-------------------------------------------------------------
0.0.0.0         2.2.2.2         0xffffffff80000001 1333  0xf2f1   0
5.5.5.5         3.3.3.3         0xffffffff80000001  550  0x4506   0
5.5.5.5         4.4.4.4         0xffffffff80000001 1183  0x4bf8   0

 

Could anybody let me know why As external LSA was seen??

Thanks in advance.

Regards.

2 REPLIES 2

Sunuk_Kim
New Contributor

Hi

 

Thanks for your help.

 

topology

eab942d625b541eaab7891295d5308af_4bf9f220-7ad4-463d-b490-47a77e8393cb.png

 

Sw3 ospf config

eab942d625b541eaab7891295d5308af_1f61be64-b231-459c-bcb4-4b2661075ab6.png

 

Sw4 ospf config

eab942d625b541eaab7891295d5308af_f5fd5abf-d1e7-4f17-9556-44d8bc73be36.png

 

Tomasz
Valued Contributor II

Hi,

 

Would that be possible if you shared your OSPF config please? That might help to review that.

 

Cheers,

Tomasz

GTM-P2G8KFN