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© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialBSCI 1 BSCI Module 3 Lesson 7 - Stub, Totally Stubby, and Not-So-Stubby Areas OSPF © 2008 Cisco Systems, Inc. All rights reserved.BSCI 2 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Objective Configuring OSPF Area Types Using Stub and Totally Stubby Areas Configuring Stub Area OSPF Stub Area Configuration Example Configuring Totally Stub Areas Totally Stubby Area Configuration Example Interpreting Routing Tables Configuring Not-So-Stubby Areas Configuring Not-So-Stubby Area Example Configuring an NSSA Totally Stubby Area Example Verifying All Stub Area Types © 2008 Cisco Systems, Inc. All rights reserved.BSCI 3 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Configuring OSPF Area Types Standard area: Accepts link updates, route summaries, and external routes (the default). © 2008 Cisco Systems, Inc. All rights reserved.BSCI 4 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Configuring OSPF Area Types © 2008 Cisco Systems, Inc. All rights reserved.BSCI 5 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Using Stub and Totally Stubby Areas © 2008 Cisco Systems, Inc. All rights reserved.BSCI 6 CCNP – BSCI Bachkhoa Networking Academy Stub Area A stub area is an area into which AS External LSAs are not flooded. And if type 5 LSAs are not known inside an area, type 4 LSAs are unnecessary; these LSAs are also blocked As in any area, all routers in a stub area must have identical link- state databases. To ensure this condition, all stub routers will set a flag (the E-bit) in their Hello packets to zero. No router within a stub area can be an ASBR. Virtual links cannot be configured within, nor transit, a stub area. Học viện mạng Bách Khoa - www.bkacad.com © 2008 Cisco Systems, Inc. All rights reserved.BSCI 7 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Configuring Stub Area © 2008 Cisco Systems, Inc. All rights reserved.BSCI 8 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com OSPF Stub Area Configuration Example © 2008 Cisco Systems, Inc. All rights reserved.BSCI 9 CCNP – BSCI Bachkhoa Networking Academy Totally Stub Areas The totally stubby area is a Cisco proprietary enhancement that further reduces the number of routes in the routing table. A totally stubby area blocks external type 5 LSAs and summary type 3 and 4 LSAs (interarea routes) from entering the area. Totally stubby areas use a default route to reach not only destinations external to the autonomous system but also all destinations external to the area. Học viện mạng Bách Khoa - www.bkacad.com © 2008 Cisco Systems, Inc. All rights reserved.BSCI 10 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Configuring Totally Stub Areas [...]... Networking Academy Activity 3.7.1 Drag and Drop: ID the Area –Upon completion of this activity, the student will be able to identify the difference between stub and totally stubby areas in OSPF BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 20 CCNP – BSCI Bachkhoa Networking Academy Self Check 1 Stub vs Totally Stub 2 NSSA vs totally NSSA 3 How to advertise default-route... Bachkhoa Networking Academy Configuring Not-So-Stubby Areas BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 14 CCNP – BSCI Bachkhoa Networking Academy Configuring Not-So-Stubby Areas BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 15 CCNP – BSCI Bachkhoa Networking Academy Configuring Not-So-Stubby Area Example To cause... default-information-originate option of the area area-id nssa command on router 2 BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 16 CCNP – BSCI Bachkhoa Networking Academy Configuring an NSSA Totally Stubby Area Example A single default route replaces both inbound-external (type 5) LSAs and summary (type 3 and 4) LSAs into the area.The NSSA ABR, which is router... Networking Academy Totally Stubby Area Configuration Example BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 11 CCNP – BSCI Bachkhoa Networking Academy Interpreting Routing Tables BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 12 CCNP – BSCI Bachkhoa Networking Academy Configuring Not-So-Stubby Areas BSCI © 2008... www.bkacad.com 22 CCNP – BSCI Bachkhoa Networking Academy Q and A BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 23 CCNP – BSCI Bachkhoa Networking Academy Resources How Does OSPF Generate Default Routes? –http://www.cisco.com/en/US/tech/tk365/technologies_tech_not e09186a0080094a74.shtml OSPF Not-So-Stubby Area (NSSA) –http://www.cisco.com/en/US/tech/tk365/technologies_tech_not . Systems, Inc. All rights reserved. Cisco ConfidentialBSCI 1 BSCI Module 3 Lesson 7 - Stub, Totally Stubby, and Not-So-Stubby Areas OSPF © 2008 Cisco Systems, Inc. All rights reserved.BSCI 2 CCNP. Configuring OSPF Area Types Using Stub and Totally Stubby Areas Configuring Stub Area OSPF Stub Area Configuration Example Configuring Totally Stub Areas Totally Stubby Area Configuration. Configuration Example Interpreting Routing Tables Configuring Not-So-Stubby Areas Configuring Not-So-Stubby Area Example Configuring an NSSA Totally Stubby Area Example Verifying All Stub Area
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