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RE: OSPF wildcard [7:75371] posted 09/13/2003
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Zsombor Papp wrote:
> 
> You can use the subnet mask, it will convert to the wildcard
> (inverting bits).
> 
> Do you remember why "the recommended practice, at least in the
> CCIE Power Session, is to use the same mask as the interface IP
> address"? I would think the logical choice in most cases is to
> use the mask of the AS. That way the exact same single-line
> command can be used on every router.

Well, except on ABRs. There I can see why per interface statements might
make sense.

> That's assuming that you
> want to run OSPF on every single interface, of course.
> 
> Thanks,
> 
> Zsombor
> 
> Reimer, Fred wrote:
> > 
> > Huh?  The network command uses wildcard mask, not subnet
> mask.
> > How can
> > "OSPF calculate the wild card mask on its own [given] the
> > subnet mask
> > directly?"  That doesn't make too much sense.
> > 
> > OSPF uses the subnet mask on the interface itself, once it
> > determines what
> > interfaces to include.  The wildcard mask used in the network
> > command has
> > nothing to do with the network mask used in advertisements.
> > 
> > Fred Reimer - CCNA
> > 
> > 
> > Eclipsys Corporation, 200 Ashford Center North, Atlanta, GA
> > 30338
> > Phone: 404-847-5177  Cell: 770-490-3071  Pager: 888-260-2050
> > 
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> > 
> > -----Original Message-----
> > From: Laxmi_Narsaiah [mailto:Narsaiah@xxxxxxxxxx] 
> > Sent: Saturday, September 13, 2003 8:47 AM
> > To: cisco@xxxxxxxxxxxxxx
> > Subject: RE: OSPF wildcard [7:75371]
> > 
> > Give the subnet mask directly, OSPF calculate the wild card
> > mask on its
> > own....
> > 
> > -----Original Message-----
> > From: maine dude [mailto:ciscobloke@xxxxxxxxxxx]
> > Sent: Saturday, September 13, 2003 6:11 PM
> > To: cisco@xxxxxxxxxxxxxx
> > Subject: OSPF wildcard [7:75371]
> > 
> > 
> > Hi,
> > 
> > Just going through some ospf practice, I would like to
> > advertise 3 interfaces 10.60.2.1/23, 10.60.4.1/30 and
> > 10.90.20.10/32. I would go ahead and put the following
> > commands network 10.60.2.1 0.0.0.0 area 0 and
> > 10.60.4.1 0.0.0.0 area 0 and finally 10.90.20.10
> > 0.0.0.0 area 0.
> > 
> > However if i wanted get specific subnet information,
> > how would i do that?
> > 
> > Thanks in advance,
> > 
> > Dj
> > 
> >
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