myITmicroblog

This is second post about OSPF and today I will review how stub area behaves comparing to normal area (from previous post).   In this scenario R6, R7 and R8 can't reach R10's prefixes because LSA5 is not allowed withing a stub area. R6#sh ip route       10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks C        10.0.0.0/24 is directly connected, FastEthernet0/0 L        10.0.0.6/32 is directly connected, FastEthernet0/0 O IA     10.1.0.0/24 [110/2] via 10.0.0.7, 00:14:18, FastEthernet0/0 O IA     10.2.0.0/24 [110/3] via 10.0.0.7, 00:00:07, FastEthernet0/0 C        10.10.10.0/24 is directly connected, Loopback0 L        10.10.10.6/32 is directly connected, Loopback0 R6#sh ip ospf database database-summary          ...

I decided to review what I know about OSPF areas and what types of LSA are exchanged inside each type of areas. The first one is a normal area (not the backbone one). Over the next few posts I’m going to change area 1 type to see what is the difference. Below you can see what I see on every router. R6#sh ip route       10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks C        10.0.0.0/24 is directly connected, FastEthernet0/0 L        10.0.0.6/32 is directly connected, FastEthernet0/0 O IA     10.1.0.0/24 [110/2] via 10.0.0.7, 03:17:09, FastEthernet0/0 O IA     10.2.0.0/24 [110/3] via 10.0.0.7, 02:41:26, FastEthernet0/0 C        10.10.10.0/24 is directly connected, Loopback0 L        10.10.10.6/32 is directly connected, Loopback0     ...