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I want to know why when I configured OSPF process, I usually configure a "default passive" statement. I also configure a "no passive interface" statement on interface which I want OSPF to participate in. However, in order for OSPF to work in the below configuration, I had to remove the default and the no passive statements.
If you want to make router adjacency then no used "no passive-interface" command on that interface in which both routers are connected to each other to make adjacency. By default passive-interface is on in every interface in routers.
you would remove the "no passive-interface" command on those interface in which you want to create neighbor-ship between routers. After that neighbor-ship will up.
Different between passive and no-passive command are:
1) no passive-interface command on interfaces where adjacency are desired.
2) passive-interface default command to make all interfaces passive by default.
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