From: Yves Fauser (Yves@xxxxxxxxx)
Date: Wed Aug 15 2001 - 15:56:34 GMT-3
Hi Jeffrey,
If you want to take an Interface into ospf it doesn't matter which of the
statement you use.
But be aware of the consequences that the 0.0.0.0 wildcard mask has, it
changes the forwarding address in the database.
To be short if you use the 0.0.0.0 Mask the forwarding address will be 0.0.0.0
in the LSA. If you take 0.0.0.255 the forwarding address will be the address
of the next hop. You can have various Problems with 0.0.0.0 or next hop
depending on the topology. Another thing is that there is a Bug in all
versions when redistributing ospf into RIP.
I'll send some links later.
Yves
Jeffrey Levine wrote:
> I have noticed in some lab scenarios that when the instructions say that a
> router interface should be advertised in a routing protocol, the labs
> sometimes advertise only the interface, othertimes an entire subnet.
>
> For example, let's say it's an ethernet interface with address
> 192.168.1.1/24 being advertised under OSPF. I've seen the following:
>
> router ospf 64
> net 192.168.1.1 0.0.0.0 area 0
>
> or
>
> router ospf 64
> net 192.168.1.1 0.0.0.255 area 0
>
> I wouldn't be concerned if there were some consistency. I've seen the lab
> instructions state "interface" and then seen the entire network advertised
> and vice-versa.
>
> Any thought?
>
> Jeffrey S. Levine
>
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