From: Volkov, Dmitry (Toronto - BCE) (dmitry_volkov@xxxxxxxxx)
Date: Sat Aug 31 2002 - 14:19:52 GMT-3
Brian,
> > 3. Why has 0.0.0.0 been used as wildcard-mask all the
> > time? What's the advantage?
>
> The "network" statement in IGP doesn't actually mean which
> networks you are advertising. It means which interfaces are
> participating in the protocol. For example:
>
> Router EIGRP 1
> Network 1.2.3.4 0.0.0.0
>
> This means that only the interface 1.2.3.4 is participating
> in the EIGRP
> domain.
>
> Router EIGRP 1
> Network 0.0.0.0
>
> This means that all interfaces are participating in the EIGRP
> domain. I
> always use 0.0.0.0 for clarity. I suppose it's just a matter of
> preference.
There can be cases (redistr on broadcast subnet) when use wildcard mask
0.0.0.0 is not desirable:
http://www.netmasterclass.net/site/articles/Forwarding%20behavior%20of%20IGP
%20routing%20protocols%20on%20the%20broadcast%20part%20I.pdf
What do You think, can we say (as rule of thumb):
that wild mask should cover the same network as configured on interface
running OSPF.
Do You know any examples when it will not work ?
BTW, maybe it's FAQ, Where can I get config solution for your sample Lab ?
Thanks,
Dmitry
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:43 GMT-3