General Network Management

 Regarding OSPF NSSA

Sunuk Kim's profile image
Sunuk Kim posted 08-18-2021 10:50

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.

Tomasz's profile image
Tomasz

Hi,

 

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

 

Cheers,

Tomasz

Sunuk Kim's profile image
Sunuk Kim

Hi

 

Thanks for your help.

 

topology

 

Sw3 ospf config

 

Sw4 ospf config