Understanding OSPF Stub Area Types

 

First enables make sure we've been at ease the actual LSA forms, since you won't need to understand Stubs before you decide to understand LSAs 100% while getting ccie training in Pakistan.

*LSA - Web page link Condition Advert, Each and every LSA carries a LSID (Link Condition IDENTIFICATION, such as Router-ID with the LSAs)

LSA 1 - Router LSA, A single per Router (Generated by means of Each and every Router)
LSA only two - System LSA, A single per System (Generated by means of DR)
LSA 3 - Conclusion LSA, A single per Region (generated by means of ABR when LSAs 1 and also only two are shot into a different Area). LSA3 = Subnet + Disguise + Charge to succeed in the actual System
LSA four - Conclusion Outside LSA, A single per Autonomous Program (Generated by means of ASBR)
LSA 5 - Outside LSA, Shot into OSPF through a different redirecting process (non-ospf)
LSA 6 - Grout Membership rights LSA, Definitely not backed by means of Cisco
LSA 7 - NSSA Outside, Created by means of ASBR in the NSSA rather than LSA 5 (details spelled out underneath, NSSA Section)
LSA 8-11 - Definitely not put in place by means of Cisco

Examine the actual LSA Data while using command:

Cisqueros_R3(config-router)#do display ip ospf stat

OSPF Router together with IDENTIFICATION (3. 3. 3. 3) (Process IDENTIFICATION 1)

Region 0: SPF algorithm accomplished four occasions

Conclusion OSPF SPF figure

SPF calculation moment
Delta To Intra D-Intra Summ D-Summ Ext D-Ext Entire Reason
00: twenty two: twenty six 0 0 0 0 0 0 0 Third
00: twenty two: of sixteen 0 0 0 0 0 0 0 Third
00: twenty one: 47 0 0 0 0 0 0 0 Third, And, SN
00: 20: 01 0 0 0 0 0 0 0 Third, SN



Examine the actual OSPF DATA BANK and also every one of the LSAs presently inside:

Cisqueros_R3#show ip ospf data bank

OSPF Router together with IDENTIFICATION (3. 3. 3. 3) (Process IDENTIFICATION 1)

Router Web page link Expresses (Area 0) <--- LSA1

Web page link IDENTIFICATION ADV Router Age Seq# Checksum Web page link matter
only two. only two. only two. only two only two. only two. only two. only two 79 0x80000003 0x000E94 only two
3. 3. 3. 3 3. 3. 3. 3 80 0x80000007 0x006F2C four
four. four. four. four four. four. four. four fifty-two 0x80000004 0x007781 3

Net Web page link Expresses (Area 0) <--- LSA2

Web page link IDENTIFICATION ADV Router Age Seq# Checksum
10. 1. 23. 3 3. 3. 3. 3 80 0x80000001 0x00658F

Conclusion Net Web page link Expresses (Area 0) <--- LSA3

Web page link IDENTIFICATION ADV Router Age Seq# Checksum
1. 1. 1. 0 only two. only two. only two. only two 124 0x80000002 0x00B33C
only two. only two. only two. 0 only two. only two. only two. only two 124 0x80000002 0x000D20
10. 1. 12. 0 only two. only two. only two. only two 124 0x80000002 0x00BA22
10. 1. 45. 0 four. four. four. four 43 0x80000001 0x00F5F4
forty-four. four. four. 0 four. four. four. four 43 0x80000001 0x008077

Router Web page link Expresses (Area 1) <--- LSA1, Region 1

Web page link IDENTIFICATION ADV Router Age Seq# Checksum Web page link matter
3. 3. 3. 3 3. 3. 3. 3 fifth 89 0x80000007 0x00AC78 0

Router Web page link Expresses (Area 2) <--- LSA2, Region 1

Web page link IDENTIFICATION ADV Router Age Seq# Checksum Web page link matter
3. 3. 3. 3 3. 3. 3. 3 85 0x80000006 0x00AE77 0

STUB - No LSA 5 (E1 and also E2) publicized about ABRs. You can not use a Personal Web page link the following, although GRE Tube is usually an selection.

Totally Stubby Region - Stub with no Conclusion Paths (LSA3), consequently zero Intra-Area (IA O). Only Way and also System LSAs (LSA1 and also LSA2) within the Region
The actual "no-summary" attribute is only essential about ABR, considering that the ABR would be the solely router that actually comes the actual LSA 3.

* STUB and also Totally Stubby Region: REMEMBER in order to configure the actual "area Times stub" about every one of the routers in your community Times. The actual routers that ONLY belong to the location Times may AUTOMATICALLY have the Default Way shot while using ABR as a Default Gateway.

NSSA - LSA3 and also LSA7 duplicated into LSA5 (External, E1 and also E2)
* ASBR Creates LSA 7 rather than LSA 5 considering that the LSA 5 just isn't backed by means of NSSA. Then a ABR changes that into LSA 5 for the ingress through NSSA to the frequent OSPF Region.

Totally Stubby NSSA - No Conclusion (LSA3), although Outside Paths Integrated (LSA5).