From: theoden@monmouth.com
Date: Wed Mar 17 2004 - 12:57:17 GMT-3
Ahmed gave great explanation for OSPF. All to add maybe is read lab
scenario carefully. I do practice lab where requirement state "specify
only interfaces of interest in OSPF network statement" (as in some Aset
lab if you have access to these lab). So, must use wildcard 0.0.0.0 in
this case.
For EIGRP, I have suggestion. Set up a router (Router A) with several
interfaces, say, with 137.10.X.X network with sunbnet mask of
255.255.255.0 on interfaces - for example 137.10.30.1; 137.10.100.1;
137.10.200.1. Then configure EIGRP; make all interfaces passive except
one interface to another EIGRP peer, say Router B, (assume 137.10.30.0 is
subnet connecting Router A & B); use network 137.10.0.0 statement. After
configuring EIGRP on router B, look at ip routing table. You see all
subnets in table - the directly connected plus the other two networks via
EIGRP as so:
Gateway of last resort is not set
137.10.0.0/24 is subnetted, 3 subnets
D 137.10.200.0 [90/307200] via 137.10.30.1, 00:00:06, Ethernet0/0
C 137.10.30.0 is directly connected, Ethernet0/0
D 137.10.100.0 [90/307200] via 137.10.30.1, 00:00:06, Ethernet0/0
Next, on router A, tighten up EIGRP network statement using network
137.10.30.0 255.255.255.0. This time you only get:
Gateway of last resort is not set
137.10.0.0/24 is subnetted, 1 subnets
C 137.10.30.0 is directly connected, Ethernet0/0
Again, it depends on requirements of your practice lab.
I hope this has been helpful.
Sincerely,
Theofanis
> When you specify the wildcard 0.0.0.0 you are just enabling ospf on an
> interface with the address 10.10.10.1 only,
>
> versus
>
> 0.0.0.255 means that the whole last octed will be able to run ospf. The
> good example will be, if you have a router with three serial interfaces.
> All the subnets are derived from 10.10.10.0/30, so 10.10.10.0,
> 10.10.10.4,10.10.10.8 and so on. Now you want to run ospf.
>
> You could do either
>
> router ospf 1
> network 10.10.10.1 0.0.0.0 area 0
> network 10.10.10.5 0.0.0.0 area 0
> network 10.10.10.9 0.0.0.0 area 0
>
> or just simply
>
> network 10.10.10.0 0.0.0.255 area 0
>
> HTH
>
> Ahmed
>
> ----- Original Message -----
> From: "Budi Gunawan" <bgunawan@hotpop.com>
> To: <ccielab@groupstudy.com>
> Sent: Tuesday, March 09, 2004 6:10 PM
> Subject: The Subnet
>
>
> > Hi All,
> >
> > I have some questions regarding configuring the dynamic routing protocol
> > with difference subnets..
> > What is the different between these configurations and when to apply it :
> > router ospf 1
> > network 10.10.10.1 0.0.0.0 area 0
> > network 10.10.20.1 0.0.0.0 area 1
> > and,
> > router ospf 1
> > network 10.10.10.0 0.0.0.255 area 0
> > network 10.10.20.0 0.0.0.255 area 1
> > Also between,
> > router eigrp 100
> > network 10.10.10.1 0.0.0.0
> > network 10.10.20.1 0.0.0.0
> > and,
> > router eigrp 100
> > network 10.10.10.0 255.255.255.0
> > network 10.10.20.0 255.255.255.0
> >
> > And how is the result?
> >
> > Thank you and regards,
> > Budi.
> >
> > _______________________________________________________________________
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