From: Tarun Pahuja (pahujat@gmail.com)
Date: Wed Nov 07 2007 - 07:20:49 ART
Gregory,
You can configure some networks with two separate subnets on
the same physical segment. In this case, EIGRP routers on one subnet may not
be able to communicate with EIGRP routers on the other subnet. For OSPF and
EIGRP it is important that the neighbors be on the common subnet to ensure
proper functionality of the protocols.
You can connect two Areas(atleast one being area 0) in OSPF connected via a
Stub transit area using a GRE tunnel. Some of the drawbacks would include
additional overhead on the tunnel endpoints as they would have to
encap/decap every packet going through the tunnel, GRE header adds
additional overhead.
You can use the network command under ospf process or use interface level
ospf command, you are adding networks to ospf process in both cases.
HTH,
Tarun
On 11/6/07, Gregory Gombas <ggombas@gmail.com> wrote:
>
> Yes, OSPF is one of those nifty protocols that allows you to peer
> between 2 IPs in different subnet.
>
> Does anyone know if thats true with RIP and EIGRP? I think RIP can be
> configured to disable the source address check but what about EIGRP?
>
> Joseph Saad - Can you elaborate on using interface level ospf versus
> network statement?
>
> Thanks
>
>
> On 11/6/07, Alex Steer <alex.steer@eison.co.uk> wrote:
> > It is international OSPF month, not week!
> >
> > Can you configure a tunnel between 2 IPs not in the same subnet? I
> didn't think you could?
> > Everybody seems to be suggesting tunnels though so have I missed
> something?
> >
> > ________________________________
> >
> > From: nobody@groupstudy.com on behalf of Gregory Gombas
> > Sent: Mon 11/5/2007 9:30 PM
> > To: Alex Steer
> > Cc: M e; ccielab@groupstudy.com
> > Subject: Re: ospf virtual-link over totally stubby area
> >
> >
> >
> > Geez what is this, OSPF week?
> >
> > You can use ip unnumbered based off a loopback interface in Area0.
> >
> > On 11/5/07, Alex Steer <alex.steer@eison.co.uk> wrote:
> > > Yeh, It give me an error when I try to configure a virtual-link over
> area47.
> > >
> > > The lab said you cannot make new IP addresses. How can you configure
> a gre
> > > tunnel?
> > >
> > > ________________________________
> > >
> > > From: M e [mailto:iosluver@gmail.com]
> > > Sent: Mon 11/5/2007 6:29 PM
> > > To: Alex Steer
> > > Subject: Re: ospf virtual-link over totally stubby area
> > >
> > >
> > > Ajay just hi the nail on the head. Stub areas don't support
> virtual-links so
> > > the only other way to do this is to use a GRE tunnel.
> > >
> > >
> > > On 11/5/07, Alex Steer <alex.steer@eison.co.uk> wrote:
> > >
> > > Hi,
> > >
> > > I got completely stuck on this question I hoped someone maybe
> able to help
> > > me
> > > out. The topology is as follows
> > >
> > > AREA 0=Router4====area 47=====Switch1=area0
> > >
> > > The question was (word for word):-
> > >
> > > Configure OSPF area 47 on the Ethernet segment between R4 and
> SW1
> > > Devices in OSPF area 47 should only receive LSA of type 1, 2
> and a default
> > > of
> > > type 3.
> > >
> > > To me that says configure Router 4 with "area 47 stub
> no-summary"
> > > The problem then is that I cant configure a virtual-link to
> SW1s area0.
> > > Is the answer on router4:-
> > > configure area47 as normal area
> > > configure "default-information orginate always" on router4
> > > configure "area 47 filter-list prefix prefix-list"
> > > ip prefix-list prefix-list permit 0.0.0.0/0 le 32
> > >
> > > Can anybody suggest for sure?
> > >
> > > Many thanks
> > >
> > > Alex
> > >
> > >
> >
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