From: Wes Smith (wesmith@rogers.com)
Date: Sat Mar 27 2004 - 10:43:21 GMT-3
IP Unnumbered works fine for OSPF Point-Point ckts such as tunnels or
serial links.
Use an interface in the area you want the link to be in
Ie .. 'ip unnumbered lo0'
Wes
Scott, Tyson C wrote:
>Will an IP unnumbered interface work? I don't think it does. I believe
>you need to have an IP address on the interface for OSPF. I had the
>following scenario on a practice lab I did. I did the scenario twice.
>I believed it worked in the newer code but I could not get the RIP
>routes that router4 new about to SW1. I had other RIP routes coming to
>router3 from another router that SW1 would learn but not the routes from
>R4 RIP. This is another subject though.
> My main point is that in either situation, with the two codes I
>tried it on (12.2(2)T and 12.2(15)T), the GRE tunnel would not work
>unless it had an IP address.
> It is my understanding that unless the test states not to add IP
>addresses and interfaces to a router you can do it. But if in doubt ask
>the proctor with a statement of what you are looking to do and that it
>doesn't state not to can you do it.
>
> R5___
> |
> FRAME HUB & SPOKE
> OSPF AREA0------R3____OTHER IGP
> ___|
> __R4___
> | |
> RIP OSPF STUB
>BB2_| |_SW1____Area0
>
>Regards,
>
>Tyson Scott
>Agilent Problem Management Team
>Managed Network Services
>Phone: 313-583-5812
>Pager: 877-997-0811
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Edwards, Andrew M
>Sent: Friday, March 26, 2004 12:00 PM
>To: christopher snow; Ashok Verma (ashoverm)
>Cc: ccielab@groupstudy.com
>Subject: RE: OSPF ON GRE Tunnel
>
>Effectively building a tunnel and putting it into the backbone of area 0
>is what a virtual-link does... So you are just going to need to build
>your own virtual link 8)
>
>-----Original Message-----
>From: christopher snow [mailto:cbsnow31@yahoo.com]
>Sent: Friday, March 26, 2004 5:52 AM
>To: Ashok Verma (ashoverm)
>Cc: ccielab@groupstudy.com
>Subject: Re: OSPF ON GRE Tunnel
>
>
>Do an ipunnumbered of an interface that is already in area 0.
>
>Chris
>
>
>
>"Ashok Verma (ashoverm)" <ashoverm@cisco.com> wrote:
>Hi all
>
>For all OSPF gurus.....here is a very good query....
>
>R1--------R2-----R3
>
>Between R2 and R3 ospf area 0 is running, and between R1 and R2 area 3,
>
>On R1 I have a loopback address ( 1.1.1.1) and my requirement is to put
>it in area 1. And I should not be using the virtual link. I should have
>1.1.1.1 in R3's routing table.Is any way to do it .
>
>As per my views, there are two ways .....
>
>Solution 1: Use Tunnel between R2 and R1 and then assign the tunnel IP
>in ospf area 0 ...........But the question is In real lab we are not
>allowed to use any extra ip....so can we still use this solution using
>the IP unnumberd.( in that case what ip we should be putting in area 0
>??)
>
>Solution 2: Use multiple process on R1 and then redistribute them .But
>again question is are we allowed to use multiple process ids in ospf.
>
>Which solution look better from the real lab point of view.
>
>
>Regards.
>
>Ashok Kumar Verma
>CCIP,CCDP,CCNP
>Network Consulting Engineer
>Customer Advocacy Advanced Service Dep.
>Service Provider AS Div.2
>Cisco Systems, K.K.Japan.
>
>Tel: +81-3-5324-4583
>e-mail: ashoverm@cisco.com
>
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