OSPF network Statement Syntax
Posted by Aragoen Celtdra on 22nd June 2008
I’ve been reviewing OSPF and EIGRP the past two days and in researching (google) some outside resource I stumbled upon this post by CCIE Journey. The article is originally by Ivan Pepelnjak, but because I read it on Carl’s website first he deserves a trackback for helping disseminate the info. 
The article basically talks about the network statement no longer being needed to configure an OSPF interface. If you’re familiar with the basic concept (and I’m proud to say, I am – I think 
), configuring the network statement on a router essentially adds the particular interface implied on the command. I say implied because instead of explicitly saying put this interface in OSPF area such and such, you configure the ip address or subnet range that implies the interface/s you want. For example, you typically configure the following router subcommand:
network 192.168.2.0 0.0.0.255 area 0
With the change, implemented in IOS release 12.3(11)T (integrated in 12.4), you can configure the command on an interface with:
ip ospf process area area-id
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