From: Jason Madsen (madsen.jason@gmail.com)
Date: Mon Nov 17 2008 - 14:30:35 ARST
Hi,
I didn't quite follow what you asked, but hopefully this info' can be of
help. You can certainly advertise your GRE tunnel addresses into whatever
routing protocol you're using. The main issue with GRE tunnels, in terms of
loops, is that for your GRE tunnel to work your device has to "know" how to
get to the distant end physical interface IP address AND most importantly
once you get your GRE tunnel established, you NEVER want your distant end
physical interface IP address to be re-learned and preferred via your GRE
tunnel.
There are a number of ways to ensure that that rule isn't violated. You can
use different routing protocols, you can modify distance values, you can use
distribute lists etc. Just ensure that your physical interface IP addresses
aren't learned AND preferred via your GRE tunnel.
Jason
On Mon, Nov 17, 2008 at 7:13 AM, GAURAV MADAN <gauravmadan1177@gmail.com>wrote:
> Hi All
>
> This is 2nd time i am asking related question on this forum .. PLss
> excuse me for that .. i still couldnt get the concept .
>
> f0/0 f0/0
> | |
> R1========= Serial========= R2
> ========= FE =========
>
> 1) I want comm between f0/0 of R1 and f0/0 of R2.
> 2) I want this to go via GRE tunnel . I want to use 1 and only 1
> protocol OSPF .
> 3) Tunnel should be able to sustain failures in one of link between 2
> routers.
>
> R1
> ------
> interface Tunnel12
> ip address 200.0.0.1 255.0.0.0
> keepalive 10 3
> tunnel source Loopback0
> tunnel destination 2.2.2.2
>
> R2
> -----
> interface Tunnel12
> ip address 200.0.0.2 255.0.0.0
> keepalive 10 3
> tunnel source Loopback0
> tunnel destination 1.1.1.1
>
> I do understand the fact that since I am learning tunn dest via ospf
> and hence can not establish OSPF adj on tunnel interface . Having said
> that what are the options to do this task keeping in mind all above
> req.
>
> I was able to do this by violating a few req :
> [A] I learnt 2.2.2.2 on R1 via rip and 1.1.1.1 on R2 via RIP . Hence
> OSPF can be est on tunn and hence communication was over OSPF .
>
> PLease suggest
> Gaurav Madan.
>
>
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