Saturday, June 10, 2006

 

OSPF Link State database. (Question #70)


Consider the three routers shown in the network topology diagram above. The three routers are running OSPF and a minute or so after rebooting all three routers at the same time, the output of show ip ospf database on the three routers shows the following -

Router R1

R1#show ip ospf database

OSPF Router with ID (1.1.1.1) (Process ID 100)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 64 0x80000002 0x0069F7 3
2.2.2.2 2.2.2.2 561 0x80000007 0x00DD97 5
3.3.3.3 3.3.3.3 560 0x80000005 0x007DB1 3


Router R2

R2#show ip ospf database

OSPF Router with ID (2.2.2.2) (Process ID 100)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 68 0x80000002 0x0069F7 3
2.2.2.2 2.2.2.2 65 0x80000007 0x00DD97 5
3.3.3.3 3.3.3.3 64 0x80000005 0x007DB1 3


Router R3

R3#show ip ospf database

OSPF Router with ID (3.3.3.3) (Process ID 100)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 70 0x80000002 0x0069F7 3
2.2.2.2 2.2.2.2 67 0x80000007 0x00DD97 5
3.3.3.3 3.3.3.3 64 0x80000005 0x007DB1 3


Can you spot anything unusual from the above output? How was that unusual behavior achieved? What was the command used and on which router to achieve the unusual behavior shown above?

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