OSPF Mulipoint interface and LSDB.

Hi Experts,


I have configured an OSPF router in point-to-multipoint network type. But when I check LSDB details, I am getting confusing details.

R30#sh ip os inter s1/0
Serial1/0 is up, line protocol is up
  Internet Address 10.1.1.3/24, Area 0
  Process ID 100, Router ID 3.3.3.3, Network Type POINT_TO_MULTIPOINT, Cost: 64
  Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT


R3 router LSA details:

R30#sh ip os database router 3.3.3.3

            OSPF Router with ID (3.3.3.3) (Process ID 100)

                Router Link States (Area 0)

  LS age: 80
  Options: (No TOS-capability, DC)
  LS Type: Router Links
  Link State ID: 3.3.3.3
  Advertising Router: 3.3.3.3
  LS Seq Number: 8000001C
  Checksum: 0x2FDF
  Length: 60
  Number of Links: 3

    Link connected to: a Stub Network
     (Link ID) Network/subnet number: 3.3.3.3
     (Link Data) Network Mask: 255.255.255.255        // THIS IS THE LOOPBACK INTERFACE IN R3 AND IT MAKES PERFECT SENSE
      Number of TOS metrics: 0
       TOS 0 Metrics: 100

    Link connected to: another Router (point-to-point) // WHY THIS P2MP LINK IS ADVERTISED AS A P2P LINK???
     (Link ID) Neighboring Router ID: 1.1.1.1
     (Link Data) Router Interface address: 10.1.1.3
      Number of TOS metrics: 0
       TOS 0 Metrics: 64

    Link connected to: a Stub Network // WHAT IS THIS STUB NETWORK?
     (Link ID) Network/subnet number: 10.1.1.3
     (Link Data) Network Mask: 255.255.255.255
      Number of TOS metrics: 0
       TOS 0 Metrics: 0


can anyone please help me to understand how this LSDB entries are calculated.