From: Gregory Gombas (ggombas@gmail.com)
Date: Wed Nov 07 2007 - 11:50:26 ART
With OSPF, isn't the rule for neighbors to be on common subnet relaxed
when using ip unnumbered?
On Nov 7, 2007 5:20 AM, Tarun Pahuja <pahujat@gmail.com> wrote:
> 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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