Right condition for exchange the router by OSPF
The conditions for properly conveying route information are summarized in the table below.
| Item | Contents | Description |
| Establish neighbor | In Hello packets, following is the same,
| |
| Exchange LSA | The topology type of Connetion Interface is multi-access, and there is router(s) who has DR priority more than 1. MTU of Connection Interface is the same. | If Priority is 0, do not proceed from 2way. If MTU is different, do not proceed from ExStart. |
| Make Shortest Path Tree | The topology type must be the same. (Multi-access to each other, or P2P each other) | LSA exchange has done even if topology type is different, but cannot make the tree because the link is inconsistent. |
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