Regarding OSPF NSSA

Sunuk_Kim — Wed, 18 Aug 2021 17:50:30 GMT

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.

Re: Regarding OSPF NSSA

Tomasz — Fri, 10 Sep 2021 02:59:42 GMT

Hi,

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

Cheers,

Tomasz

Re: Regarding OSPF NSSA

Sunuk_Kim — Thu, 16 Sep 2021 08:34:25 GMT

Thanks for your help.

topology

Sw3 ospf config

Sw4 ospf config

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Regarding OSPF NSSA

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Re: Regarding OSPF NSSA