Module 3 - Multiarea OSPF Operation pptx

© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialBSCI 1 BSCI Module 3 Lesson 6 - Multiarea OSPF Operation OSPF © 2008 Cisco Systems, Inc. All rights reserved.BSCI 2 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Objective  Large OSPF Network Issues  OSPF LSA Types  OSPF LSA Types (cont.)  Interpreting the OSPF LSDB and Routing Table  Interpreting the Routing Table  Calculating Costs for E1 and E2 Routes  Configuring OSPF LSDB Overload Protection  Changing the Cost Metric © 2008 Cisco Systems, Inc. All rights reserved.BSCI 3 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Large OSPF Network Issues  Hierarchical area routing separates a large internetwork into multiple areas. When you use this technique, interarea routing still occurs, but many of the internal routing operations, such as SPF calculations, remain within individual areas. –Reduced frequency of SPF calculations –Smaller routing table –Reduced LSU overhead © 2008 Cisco Systems, Inc. All rights reserved.BSCI 4 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com LSA Types © 2008 Cisco Systems, Inc. All rights reserved.BSCI 5 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com LSA Type 1 Link Types Link Type Description Link-state ID 1 Point-to-point connection to another router Neighboring router ID 2 Connection to a transit network IP address of DR 3 Connection to a stub network IP network/subnet number 4 Virtual link Neighboring router ID © 2008 Cisco Systems, Inc. All rights reserved.BSCI 6 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com The Link ID in the OSPF Database RouterA#show ip ospf database OSPF Router with ID (10.0.0.11) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 10.0.0.11 10.0.0.11 548 0x80000002 0x00401A 1 10.0.0.12 10.0.0.12 549 0x80000004 0x003A1B 1 100.100.100.100 100.100.100.100 548 0x800002D7 0x00EEA9 2 Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum 172.31.1.3 100.100.100.100 549 0x80000001 0x004EC9 Summary Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum 10.1.0.0 10.0.0.11 654 0x80000001 0x00FB11 10.1.0.0 10.0.0.12 601 0x80000001 0x00F516 <output omitted> © 2008 Cisco Systems, Inc. All rights reserved.BSCI 7 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com LSA Type 1: Router LSA  One router LSA (type 1) for every router in an area: –Includes list of directly attached links  Identified by the router ID of the originating router  Floods within its area only; does not cross ABR  Link-state ID depends on link type © 2008 Cisco Systems, Inc. All rights reserved.BSCI 8 CCNP – BSCI Bachkhoa Networking Academy LSA Type 1: Router LSA Học viện mạng Bách Khoa - www.bkacad.com © 2008 Cisco Systems, Inc. All rights reserved.BSCI 9 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Type 1: Router LSAs  The command show ip ospf database router will list all of the Router LSAs in a database. © 2008 Cisco Systems, Inc. All rights reserved.BSCI 10 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com LSA Type 2: Network LSA  Advertised by the DR of the broadcast network  Floods within its area only; does not cross ABR  Link-state ID is the DR [...]... defined OSPF process BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 27 CCNP – BSCI Bachkhoa Networking Academy The max-lsa Parameters Router(config-router)# max-lsa maximum-number [threshold-percentage] [warningonly] [ignore-time minutes] [ignore-count count-number] [reset-time minutes] Parameter Description maximum-number Maximum number of non-self-generated... mạng Bách Khoa - www.bkacad.com 26 CCNP – BSCI Bachkhoa Networking Academy OSPF LSDB Overload Protection Router(config-router)# max-lsa maximum-number [threshold-percentage] [warningonly] [ignore-time minutes] [ignore-count count-number] [reset-time minutes]  Excessive LSAs generated by other routers can drain local router resources  This feature can limit the processing of non-self-generated LSAs... different features between OSPF and EIGRP  3. 6 .3 Drag and Drop: OSPF LSA Types –Upon completion of this activity, the student will be able to identify the different OSPF LSA types BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 30 CCNP – BSCI Bachkhoa Networking Academy Self Check 1 List popular LSA types of OSPF 2 Different between E2 and E1 3 Differentiate O,... Học viện mạng Bách Khoa - www.bkacad.com 31 CCNP – BSCI Bachkhoa Networking Academy Summary  OSPF LSA Types  OSPF LSDB  Types of route  Cost BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 32 CCNP – BSCI Bachkhoa Networking Academy Q and A BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 33 CCNP – BSCI BSCI © 2008... values range from 1 to 4,294,967 in Mbps) RouterA(config-if)# ip ospf cost interface-cost  Overrides the default cost calculation Values from 1 to 65 535 can be defined BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 29 CCNP – BSCI Bachkhoa Networking Academy Activity  3. 6.1 Drag and Drop: Comparison of OSPF and EIGRP Features –Upon completion of this activity,... information across an OSPF domain This LSA is not supported in IOS BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 20 CCNP – BSCI Bachkhoa Networking Academy Type 7: Not-So-Stubby Area LSAs  The command show ip ospf database nssa-externaldisplays NSSA external LSAs BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 21... information throughout the OSPF domain  Opaque LSAs have been used to add various extensions to OSPF, such as traffic engineering parameters for Multiprotocol Label Switching (MPLS) networks BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 23 CCNP – BSCI Bachkhoa Networking Academy Interpreting the OSPF Database RouterA#show ip ospf database OSPF Router with ID... Membership LSAs are used in an enhancement of OSPF known as Multicast OSPF (MOSPF) MOSPF routes packets from a single source to multiple destinations, or group members, which share a class D multicast address Although Cisco supports other multicast routing protocols, MOSPF is not supported as of this writing  NSSA External LSAs are originated by ASBRs within not-sostubby areas (NSSAs  External Attributes... routes are not summarized, and type 3 LSA is advertised for every subnet BSCI  Link-state ID is the network or subnet advertised in the summary LSAHọc viện mạng Bách Khoa - www.bkacad.com © 2008 Cisco Systems, Inc All rights reserved 13 CCNP – BSCI Bachkhoa Networking Academy LSA Type 3: Summary LSA BSCI © 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 14 CCNP – BSCI... 2008 Cisco Systems, Inc All rights reserved Học viện mạng Bách Khoa - www.bkacad.com 28 CCNP – BSCI Bachkhoa Networking Academy Changing the Cost Metric  The cost, or metric, is an indication of the overhead to send packets over an interface Default = (100 Mbps)/(bandwidth in Mbps) RouterA(config-router)# auto-cost reference-bandwidth ref-bw  Sets the reference bandwidth to values other than 100 Mbps . ConfidentialBSCI 1 BSCI Module 3 Lesson 6 - Multiarea OSPF Operation OSPF © 2008 Cisco Systems, Inc. All rights reserved.BSCI 2 CCNP – BSCI Bachkhoa Networking Academy Học viện mạng Bách Khoa - www.bkacad.com Objective . viện mạng Bách Khoa - www.bkacad.com Objective  Large OSPF Network Issues  OSPF LSA Types  OSPF LSA Types (cont.)  Interpreting the OSPF LSDB and Routing Table  Interpreting the Routing. Types Link Type Description Link-state ID 1 Point-to-point connection to another router Neighboring router ID 2 Connection to a transit network IP address of DR 3 Connection to a stub network IP