>RouterA---------OSPF Area 0-----------RouterB---------------OSPF Area
>0-------------RouterC
>206.202.0.1/24 206.202.0.2/24 206.202.1.1/24
> 206.202.1.2/24
>
>Scenario: You have RIP routing domain and an OSPF Area 0 with
>redistribution. To reduce the number of RIP routes, you have to configure
>a summary-address in OSPF to only advertise one route to RIP networks.
>
>Configuration for RouterA:
>
>Router-A(config)#router ospf 1
>Router-A(config-router)#network 206.202.0.0 0.0.3.255 area 0
>
>I don't understand how they came up with wildcard mask 0.0.3.255. Can
>someone elaborate on this.
>Thanks in advance.
>
>Fred
Hint: the sum of each octet of a subnet mask and its corresponding
wildcard mask. Subtract the octets of this wildcard from
255.255.255.255 and see what the corresponding subnet mask will be,
and then figure out what prefix it equates to. I think you'll see
the supernetting.
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