Thông tin tài liệu:
The following will be discussed in this chapter: Multiarea OSPF implementation, types of LSAs exchanged between areas, configuring OSPFv2 and OSPFv3, verifying an OSPFv2 and OSPFv3 configuration, summarizing OSPF routes between areas.
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Lecture Routing Protocols - Chapter 8: Multiarea OSPFChapter 8: Multiarea OSPF Routing ProtocolsPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 1 Chapter 8 8.1 Multiarea OSPF 8.2 Configuring Multiarea OSPF 8.3 SummaryPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2 Chapter 8: Objectives The following will be discussed in this chapter: Multiarea OSPF implementation Types of LSAs exchanged between areas Configuring OSPFv2 and OSPFv3 Verifying an OSPFv2 and OSPFv3 configuration Summarizing OSPF routes between areasPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 3 Multiarea OSPF OperationPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 4 Why Multiarea OSPF? Single-Area OSPF Single-area OSPF is useful in smaller networks. If an area becomes too big, the following issues must be addressed: Large routing table (no summarization by default) Large link-state database (LSDB) Frequent SPF algorithm calculationsPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 5 Why Multiarea OSPF? Single-Area OSPFPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 6 Why Multiarea OSPF? Multiarea OSPF requires a hierarchical Multiarea OSPF network design and the main area is called the backbone area (area 0) and all other areas must connect to the backbone area.Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 7 Why Multiarea OSPF? OSPF Two-Layer Area Hierarchy Multiarea OSPF is implemented in a two-layer area hierarchy: Backbone (Transit) area - • Area whose primary function is the fast and efficient movement of IP packets. • Interconnect with other OSPF area types • Called OSPF area 0 which all other areas directly connect Regular (Non-backbone) area - • Connects users and resources • A regular area does not allow traffic from another area to use its links to reach other areasPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 8 Why Multiarea OSPF? Types of OSPF RoutersPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 9 Why Multiarea OSPF? Types of OSPF RoutersPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 10 Multiarea OSPF LSA Operation OSPF LSA TypesPresentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 11 Multiarea OSPF LSA Operation OSPF LSA Type 1Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 12 Multiarea OSPF LSA Operation OSPF LSA Type 2Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 13 Multiarea OSPF LSA Operation OSPF LSA Type 3Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 14 Multiarea OSPF LSA Operation OSPF LSA Type 4Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 15 Multiarea OSPF LSA Operation OSPF LSA Type 5Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 16 OSPF Routing Tables and Types of Routes OSPF Routing Table Entries O - Router (type 1) and network (type 2) LSAs describe the details within an area (the route is intra-area) O IA - Summary LSAs appear in the routing table as IA ...