Thursday, June 15, 2006

 

More OSPF Database Summary. (Problem #73)


Consider the above network which is a slightly modified version of the network used in Problem #72 where the area numbering has been swapped. The admin for the network made the following changes in succession to the network

1. Configured area 1 as a Normal area.
2. Configured area 1 as a NSSA area.
3. Configured area 1 as a Totally Stubby NSSA area.

After each of the steps above, she also captured the output from the show ip ospf database database-summary command. The output from her captures are shown below in scrambled order. Your task in this problem is to match the outputs A/B/C below with the area type for area 1 when the output was captured, i.e. normal/nssa/totally stubby nssa.

Output A

R3#sh ip ospf database database-summary

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

Area 1 database summary
LSA Type Count Delete Maxage
Router 3 0 0
Network 0 0 0
Summary Net 2 0 0
Summary ASBR 0 0 0
Type-7 Ext 0 0 0
Prefixes redistributed in Type-7 0
Opaque Link 0 0 0
Opaque Area 0 0 0
Subtotal 5 0 0

Process 100 database summary
LSA Type Count Delete Maxage
Router 3 0 0
Network 0 0 0
Summary Net 2 0 0
Summary ASBR 0 0 0
Type-7 Ext 0 0 0
Opaque Link 0 0 0
Opaque Area 0 0 0
Type-5 Ext 1 0 0
Prefixes redistributed in Type-5 1
Opaque AS 0 0 0
Total 6 0 0
R3#


Output B

R3#sh ip ospf database database-summary

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

Area 1 database summary
LSA Type Count Delete Maxage
Router 3 0 0
Network 0 0 0
Summary Net 1 0 0
Summary ASBR 0 0 0
Type-7 Ext 1 0 0
Prefixes redistributed in Type-7 1
Opaque Link 0 0 0
Opaque Area 0 0 0
Subtotal 5 0 0

Process 100 database summary
LSA Type Count Delete Maxage
Router 3 0 0
Network 0 0 0
Summary Net 1 0 0
Summary ASBR 0 0 0
Type-7 Ext 1 0 0
Opaque Link 0 0 0
Opaque Area 0 0 0
Type-5 Ext 0 0 0
Prefixes redistributed in Type-5 0
Opaque AS 0 0 0
Total 5 0 0
R3#


Output C

R3#sh ip ospf database database-summary

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

Area 1 database summary
LSA Type Count Delete Maxage
Router 3 0 0
Network 0 0 0
Summary Net 2 0 0
Summary ASBR 0 0 0
Type-7 Ext 1 0 0
Prefixes redistributed in Type-7 1
Opaque Link 0 0 0
Opaque Area 0 0 0
Subtotal 6 0 0

Process 100 database summary
LSA Type Count Delete Maxage
Router 3 0 0
Network 0 0 0
Summary Net 2 0 0
Summary ASBR 0 0 0
Type-7 Ext 1 0 0
Opaque Link 0 0 0
Opaque Area 0 0 0
Type-5 Ext 0 0 0
Prefixes redistributed in Type-5 0
Opaque AS 0 0 0
Total 6 0 0
R3#


Comments:
Output A (normal area)

R3#sh ip ospf database database-summary OSPF Router with ID (3.3.3.3) (Process ID 100)Area 1 database summary LSA Type Count Delete Maxage Router 3 0 0 Network 0 0 0 Summary Net 2 0 0 Summary ASBR 0 0 0 Type-7 Ext 0 (no entries here not NSSA)

Output B (nssa stubby)

R3#sh ip ospf database database-summary OSPF Router with ID (3.3.3.3) (Process ID 100)Area 1 database summary LSA Type Count Delete Maxage Router 3 0 0 Network 0 0 0 Summary Net 1 (only one summary net) 0 0 Summary ASBR 0 0 0 Type-7 Ext 1 0 0 (shows nssa characteristic)

Output C

R3#sh ip ospf database database-summary OSPF Router with ID (3.3.3.3) (Process ID 100)Area 1 database summary LSA Type Count Delete Maxage Router 3 0 0 Network 0 0 0 Summary Net 2 (more than one than not nssa stubby) 0 0 Summary ASBR 0 0 0 Type-7 Ext 1 0 0 (nssa characteristic)
 
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