OSPF Database Explanation

From: ccie2k4 (ccie2k4@gmail.com)
Date: Thu Aug 31 2006 - 03:10:06 ART


Hi All,

Could someone please help me in understanding what could be the reason that
I am seeing "Adv Router is not-reachable" when I do a show ip ospf data
asbr-summ. the part that is confusing me is that even though it says
advertising router not reachable the prefix is in the routing table and also
I can ping the advertising router. thx

RTR-01#sh ip ospf data as

            OSPF Router with ID (192.168.1.1) (Process ID 100)

                Summary ASB Link States (Area 0)

  LS age: 1 (DoNotAge)
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(AS Boundary Router)
  Link State ID: 192.168.1.2 (AS Boundary Router address)
  Advertising Router: 192.168.1.3
  LS Seq Number: 80000001
  Checksum: 0x5CC1
  Length: 28
  Network Mask: /0
        TOS: 0 Metric: 1

                Summary ASB Link States (Area 13)

  LS age: 954
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(AS Boundary Router)
  Link State ID: 192.168.1.2 (AS Boundary Router address)
  Advertising Router: 192.168.1.1
  LS Seq Number: 80000003
  Checksum: 0x78A3
  Length: 28
  Network Mask: /0
        TOS: 0 Metric: 3

  Adv Router is not-reachable
  LS age: 898
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(AS Boundary Router)
  Link State ID: 192.168.1.2 (AS Boundary Router address)
  Advertising Router: 192.168.1.3
  LS Seq Number: 80000003
  Checksum: 0x58C3
  Length: 28
  Network Mask: /0
        TOS: 0 Metric: 1

  Adv Router is not-reachable
  LS age: 863
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(AS Boundary Router)
  Link State ID: 192.168.1.2 (AS Boundary Router address)
  Advertising Router: 192.168.1.100
  LS Seq Number: 80000003
  Checksum: 0xA6D1
  Length: 28
  Network Mask: /0
        TOS: 0 Metric: 67



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