Help understanding different ways to write OSPF 'area'

Answered Question
Apr 9th, 2009
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Folks, what does the area below represent in decimal again? I am used to write as "area 0", "area 51", etc.


router ospf 1000

network 11.183.113.120 0.0.0.7 area 0.0.0.117

Correct Answer by Edison Ortiz about 8 years 1 month ago

It represents Area 117


R1 configured as area 0.0.0.117


R1#sh ip os int bri

Interface PID Area IP Address/Mask Cost State Nbrs F/C

Fa0/0 1 0.0.0.117 192.168.12.1/24 1 BDR 1/1

R1#sh ip os nei


Here is the neighbor.



Neighbor ID Pri State Dead Time Address Interface

23.3.3.3 1 FULL/DR 00:00:31 192.168.12.2 FastEthernet0/0



At the neighbor:


R2#sh ip os int bri

Interface PID Area IP Address/Mask Cost State Nbrs F/C

Fa0/0 1 117 192.168.12.2/24 1 DR 1/1


R2#sh ip os neigh


Neighbor ID Pri State Dead Time Address Interface

13.3.3.3 1 FULL/BDR 00:00:31 192.168.12.1 FastEthernet0/0



Advertising a link from the neighbor show as intra area:


R1#sh ip route 2.2.2.2

Routing entry for 2.2.2.2/32

Known via "ospf 1", distance 110, metric 2, type intra area


HTH,


__


Edison.

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Correct Answer
Edison Ortiz Thu, 04/09/2009 - 08:12
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It represents Area 117


R1 configured as area 0.0.0.117


R1#sh ip os int bri

Interface PID Area IP Address/Mask Cost State Nbrs F/C

Fa0/0 1 0.0.0.117 192.168.12.1/24 1 BDR 1/1

R1#sh ip os nei


Here is the neighbor.



Neighbor ID Pri State Dead Time Address Interface

23.3.3.3 1 FULL/DR 00:00:31 192.168.12.2 FastEthernet0/0



At the neighbor:


R2#sh ip os int bri

Interface PID Area IP Address/Mask Cost State Nbrs F/C

Fa0/0 1 117 192.168.12.2/24 1 DR 1/1


R2#sh ip os neigh


Neighbor ID Pri State Dead Time Address Interface

13.3.3.3 1 FULL/BDR 00:00:31 192.168.12.1 FastEthernet0/0



Advertising a link from the neighbor show as intra area:


R1#sh ip route 2.2.2.2

Routing entry for 2.2.2.2/32

Known via "ospf 1", distance 110, metric 2, type intra area


HTH,


__


Edison.

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