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Checking on RouterA at the other end of the connection, you see the connection to<br />

our router, RouterG, and that it is the designated router for Area 0.0.0.1:<br />

aviva@RouterA> show ospf neighbor detail<br />

Address Interface State ID Pri Dead<br />

10.0.16.2 fe-0/0/0.0 Full 192.168.19.1 128 39<br />

area 0.0.0.1, opt 0x42, DR 10.0.16.1, BDR 10.0.16.2<br />

Up 00:03:56, adjacent 00:03:56<br />

10.0.21.2 se-0/0/3.0 Full 192.168.12.1 128 33<br />

area 0.0.0.1, opt 0x42, DR 0.0.0.0, BDR 0.0.0.0<br />

Up 03:24:41, adjacent 03:24:41<br />

OSPF collects topology information for each of the areas in their respective databases:<br />

aviva@RouterG> show ospf database<br />

OSPF link state database, area 0.0.0.0<br />

Type ID Adv Rtr Seq Age Opt Cksum Len<br />

Router 192.168.17.1 192.168.17.1 0x800000d0 1481 0x2 0xebd2 60<br />

Router 192.168.18.1 192.168.18.1 0x80000083 1481 0x2 0xbd4a 60<br />

Router *192.168.19.1 192.168.19.1 0x800000a1 78 0x2 0x45a3 60<br />

Network *10.0.0.1 192.168.19.1 0x80000010 551 0x2 0x9b2e 32<br />

Network *10.0.1.2 192.168.19.1 0x80000030 851 0x2 0x5353 32<br />

Network 10.0.2.1 192.168.18.1 0x80000005 1949 0x2 0x993b 32<br />

Summary *10.0.16.0 192.168.19.1 0x80000002 77 0x2 0xa81b 28<br />

Summary *10.0.21.0 192.168.19.1 0x80000001 77 0x2 0xebc7 28<br />

Summary *10.0.22.0 192.168.19.1 0x80000001 77 0x2 0x594d 28<br />

Summary *172.19.121.0 192.168.19.1 0x80000001 77 0x2 0x69e 28<br />

Summary *172.100.1.0 192.168.19.1 0x80000001 319 0x2 0x6368 28<br />

Summary *192.168.12.1 192.168.19.1 0x80000001 77 0x2 0x1646 28<br />

Summary *192.168.42.1 192.168.19.1 0x80000001 77 0x2 0x52f7 28<br />

OSPF link state database, area 0.0.0.1<br />

Type ID Adv Rtr Seq Age Opt Cksum Len<br />

Router 192.168.12.1 192.168.12.1 0x80000054 1223 0x2 0x1540 72<br />

Router *192.168.19.1 192.168.19.1 0x80000002 77 0x2 0x771a 48<br />

Router 192.168.42.1 192.168.42.1 0x8000005b 78 0x2 0x870d 96<br />

Network 10.0.16.1 192.168.42.1 0x80000001 78 0x2 0x5147 32<br />

Summary *10.0.0.0 192.168.19.1 0x80000001 77 0x2 0x5b79 28<br />

Summary *10.0.1.0 192.168.19.1 0x80000001 77 0x2 0x5083 28<br />

Summary *10.0.2.0 192.168.19.1 0x80000001 77 0x2 0x4f82 28<br />

Summary *192.168.17.1 192.168.19.1 0x80000001 77 0x2 0x66fc 28<br />

Summary *192.168.18.1 192.168.19.1 0x80000001 77 0x2 0x5b07 28<br />

Notice that the link-state database now contains summary advertisements, which<br />

summarize routing information from one area into another.<br />

The OSPF routing table now shows destinations in Area 0.0.0.1:<br />

aviva@RouterG> show ospf route<br />

Prefix Path Route NH Metric NextHop Nexthop<br />

Type Type Type Interface addr/label<br />

192.168.12.1 Intra Router IP 13 fe-1/0/0.0 10.0.16.1<br />

192.168.17.1 Intra Router IP 1 fe-1/0/1.0 10.0.0.2<br />

192.168.18.1 Intra Router IP 1 fe-0/0/1.0 10.0.1.1<br />

192.168.42.1 Intra Router IP 1 fe-1/0/0.0 10.0.16.1<br />

Configuring a Multiarea OSPF Network | 395<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.

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