ospf mask

Internally ospf uses 255.255.0.0 format.

Are you perchance referring to the "router ospf" "network" statement? If so, then it is cisco's standard notation on "network" statements, not specific to protocol.

yeah Walter,

I am talking about the "router ospf X network X.X.0.0 0.0.255.255 area

It's just cisco way of refering to network mask? How about other routing protocols that cisco implement, do they use this notation as well?

Walter Robers> > >why is ospf netmask needs to be in the form of 0.0.255.255, but not

I do not have the time to check in detail, but the information I have found so far suggests that Yes, the standard Cisco notation for the 'router' sub-command 'network' is to use wildcard-masks rather than subnet masks.

Its because of anding I think

Kind of like the inverse mask on an ACL

Or I could be totally wrong.

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