Hello Sims,
I tried a different example from the one which are shown in the lesson, just to make sure that I understand OSPF summarization well enough. But unfortunately, I couldn’t make it work. Can you please review and let me know what’s done wrong? Thank you for your support.
R1-R3-R5 (Area 1)
R1-R2 (Area 0 - Gbps link* and reference bandwidth has been adapted to all routers to 1000)
R2-R4-R6 (Area 2 - but it’s not configured / used in this example)
R1 f1/0 and g0/0 interfaces have “ip ospf priority 2” to make the R1 the DR for all the segments.
R3 router-id: 3.3.3.3 and lo if IP addresses are advertised in ospf with “ip ospf 1 area 1” command
R5 router-id: 5.5.5.5 and lo if IP addresses are advertised in ospf with “ip ospf 1 area 1” command.
R1 ABR learns the routes via OSPF , marked as “O” in its routing table and same routes are LSA Type3 routes on R2 and shown as “O IA”. So at this stage, I return back to R1 to run the OSPF command "area 0 range " but still after this command the routes are not summarized in R2 and are shown as before.
Summary -routes for lo networks
10.10.8.0 255.255.248.0 (R5 loopbacks)
172.16.16.0 255.255.248.0 (R3 loopbacks)
