Indeed some people make it a habit of specifying the inverse mask of the subnet-mask of the interface they want to enable OSPF on. As Bryan said, there is absolutely no reason for doing that, unless a task only allows you to use one or a specific number of network statements. Both in the CCIE lab and in real life you want to be as specific as possible, so by using a 0.0.0.0 inverse mask you only match on the given IP address and you will never run into strange things. Saves another frustration during your exam :-)
-- Regards, Rick Mur CCIE2 #21946 (R&S / Service Provider) Sr. Support Engineer – IPexpert, Inc. URL: http://www.IPexpert.com On Tue, Sep 1, 2009 at 4:33 AM, Bryan Bartik <[email protected]> wrote: > Hello Uli, > > The only reason I can think of not to use 0.0.0.0 is when you want to cover > more the one interface with the network statement. It certainly does not > need to match the subnet mask and there is no functional difference if it > does or not. > > -hth > > > On Mon, Aug 31, 2009 at 7:13 PM, Stan <[email protected]> wrote: > >> They are both valid and it all depends on how specific you need to be in >> enabling OSPF. Ipexpert workbooks will walk you trough, just keep >> reading..:) >> >> Stan >> >> >> >> On 8/31/09 6:10 PM, "Uli" <[email protected]> wrote: >> >> Hi guys, >> >> When I studied CCNP in CNAP we configure ospf wildcard masks just using >> the reverse of netmask. However, in CCIE we need to be more specific so we >> use 0.0.0.0 for wildcard masks. Does anyone know what the difference between >> them and which one is more prefer in exam lab ? >> >> Cheers :) >> >> ------------------------------ >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> > > > -- > Bryan Bartik > CCIE #23707 (R&S), CCNP > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
