When I do a CCIE lab from CCIEBootCamp, I noticed two different ways to
advertise a network under OSPF.   I wonder if anyone can explain the
differences between the two.

For example:
interface fa0/0
    ip address 172.168.1.1 255.255.255.0

To advertise this network,  you can use two different commands and both works
router ospf 10
   network 172.168.1.0 0.0.0.255 area 0

or you can also use:
router ospf 10
    network 172.168.1.1 0.0.0.0 area 0

Please notice the second network command uses Exact IP address on the
interface, instead of network numbers.

Thanks

Ruihai




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