Can a Full Neighbor Relationship Be Established if the Network Types of the Two Ends of an OSPF Link Are Different?

Latest reply: Apr 20, 2017 06:06:40 775 1 0 0
Can a Full Neighbor Relationship Be Established if the Network Types of the Two Ends of an OSPF Link Are Different?
  • x
  • convention:

Adamcolob
Created Apr 20, 2017 06:06:40 Helpful(0) Helpful(0)

Yes. Assume two routers are interconnected through an Ethernet link. On one end of the link, the default network type, that is, broadcast, is adopted. The other end is configured as OSPF Peer-to-peer (P2P). Neighbor relationship can be established between these two routers, which reach the Full state by exchanging their Link State Databases (LSDBs).

However, no route can be learnt because OSPF routers need LSDBs to construct a Shortest Path Tree (SPT). The LSDBs, however, are problematic. That is, the link-state advertisements (LSAs) generated by one end consider the peer a broadcast neighbor, while the other end considers the peer a P2P neighbor. Thus, no SPT can be constructed correctly and the Shortest Path First (SPF) cannot calculate the right routes neither.
  • x
  • convention:

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