Re: MPLS over GRE

I've never had to use it before, but I've considered it for some instances, and ended up going with other solutions. Where it would be useful, is connecting your MPLS network, across a non-MPLS network, or someone elses MPLS network.

Bridging two PE routers, a P to PE router, two P routers. From a non-service provider perspective, if you have a need to run your own Enterprise MPLS network internally, you might have several remote sites that are connected to your network via a carrier MPLS, or maybe the remote site has just a normal internet pop. In both of those situations, probably more obvious to the remote site that has a normal internet pop, you can use a GRE solution, DMVPN etc, to establish a peer to peer session with your own infrastructure, from there, you can bridge your MPLS network over your carriers network, no matter what their infrastructure consist of.

This could also be used in situations such as company mergers and such to maintain continuity while doing the migration.

Hope that helps,
Craig

--- On Thu, 8/23/12, CCIE KID <eliteccie_at_gmail.com> wrote:

> From: CCIE KID <eliteccie_at_gmail.com>
> Subject: MPLS over GRE
> To: "Cisco certification" <ccielab_at_groupstudy.com>
> Date: Thursday, August 23, 2012, 9:28 AM
> Hi all
>
> I was going through some GRE use cases and i found that MPLS
> runs over GRE.
> I cant visualize any proper use case logic for this MPLS
> over GRE. And that
> GRE is termed as soft GRE. Is there anyone who worked on
> MPLS over GRE
> implementation. Where it is used extensively and how it is
> been designed
>
> I can see that when SP is not offering MPLS services , then
> we can tunnel
> over MPLs switched packets from ISP to other ISP over GRE
> where the latter
> ISP support only IP and not MPLS . Is there any other
> scenario or else any
> special use case for MPLS over GRE.
>
> Thanks in advance,
>
> --
> With Warmest Regards,
>
> CCIE KID
> CCIE#29992 (Security)
>
>
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Received on Thu Aug 23 2012 - 09:16:49 ART