LAB: OSPF Internal Summarization

Configure R5 to advertise a summary route for the VLAN 8 and 10 prefixes as they are sent into area 0.  The summary should be specific as possible.

pre verification:

Rack1R1#show ip route 155.1.10.10
Routing entry for 155.1.10.0/24
  Known via "ospf 1", distance 110, metric 3185, type inter area
  Last update from 155.1.0.5 on Serial0/0, 00:05:46 ago
  Routing Descriptor Blocks:
  * 155.1.0.5, from 150.1.5.5, 00:05:46 ago, via Serial0/0
      Route metric is 3185, traffic share count is 1

Rack1R1#show ip route 155.1.8.8 
Routing entry for 155.1.8.0/24
  Known via "ospf 1", distance 110, metric 3035, type inter area
  Last update from 155.1.0.5 on Serial0/0, 00:06:00 ago
  Routing Descriptor Blocks:
  * 155.1.0.5, from 150.1.5.5, 00:06:00 ago, via Serial0/0
      Route metric is 3035, traffic share count is 1

command:

R5:

router ospf 1

area 3 range 155.1.8.0 255.255.252.0

Output below shows that the routes 155.1.8.0 and 155.1.10.0 is now part of a summary route 155.1.8.0/22, as confirmed also by "show ip ospf database" output.
verification:

Rack1R1#show ip route 155.1.10.10             
Routing entry for 155.1.8.0/22
  Known via "ospf 1", distance 110, metric 3035, type inter area
  Last update from 155.1.0.5 on Serial0/0, 00:00:39 ago
  Routing Descriptor Blocks:
  * 155.1.0.5, from 150.1.5.5, 00:00:39 ago, via Serial0/0
      Route metric is 3035, traffic share count is 1

Rack1R1#show ip route 155.1.8.8               
Routing entry for 155.1.8.0/22
  Known via "ospf 1", distance 110, metric 3035, type inter area
  Last update from 155.1.0.5 on Serial0/0, 00:00:47 ago
  Routing Descriptor Blocks:
  * 155.1.0.5, from 150.1.5.5, 00:00:47 ago, via Serial0/0
      Route metric is 3035, traffic share count is 1

Rack1R1#show ip ospf database summary 155.1.8.0

            OSPF Router with ID (150.1.1.1) (Process ID 1)

                Summary Net Link States (Area 0)

  Routing Bit Set on this LSA
  LS age: 87
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(Network)
  Link State ID: 155.1.8.0 (summary Network Number)
  Advertising Router: 150.1.5.5
  LS Seq Number: 80000002
  Checksum: 0xF7DD
  Length: 28
  Network Mask: /22
        TOS: 0  Metric: 35