OSPF Cost Metric

From: Nate Kleven (cciemail@intellinet.ws)
Date: Wed Nov 13 2002 - 22:48:37 GMT-3


Based on the following, serial0/0.1 has a cost of 65 and ethernet0/0 has a
cost of 10. So, why is an adjacent router seeing the ethernet network at a
cost of 74? Shouldn't it be the cost of the two combined? Where am I
loosing the one?
 
R5#show ip ospf int
Ethernet0/0 is up, line protocol is up
  Internet Address 137.20.20.10/24, Area 0
  Process ID 1, Router ID 172.168.200.1, Network Type BROADCAST, Cost: 10
  Transmit Delay is 1 sec, State BDR, Priority 200
  Designated Router (ID) 200.200.200.1, Interface address 137.20.20.1
  Backup Designated router (ID) 172.168.200.1, Interface address
137.20.20.10
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    Hello due in 00:00:09
  Index 4/4, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 6
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 200.200.200.1 (Designated Router)
  Suppress hello for 0 neighbor(s)
Serial0/0.1 is up, line protocol is up
  Internet Address 172.168.100.5/24, Area 10
  Process ID 1, Router ID 172.168.200.1, Network Type POINT_TO_MULTIPOINT,
Cost: 65
  Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT,
  Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
    Hello due in 00:00:08
  Index 1/5, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 4, maximum is 7
  Last flood scan time is 0 msec, maximum is 4 msec
  Neighbor Count is 2, Adjacent neighbor count is 2
    Adjacent with neighbor 172.168.30.97
    Adjacent with neighbor 172.168.100.6
  Suppress hello for 0 neighbor(s)



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