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L2TPv3 over IPSEC Spanning-Tree

Hi,

I´ve two Datacenters which have in the future a backup Connection with an L2TPv3 over ipsec.

The tunnels are up and running an I can make Connections over it. But I want to connect on both

sides a switch which blocked the Connection via STP. So I´ve configured bad STP costs on switchports
which are connected with the Routers (3845-HSEC). But the Switchports are allways going in the desgn. forwarding state.

So I read some KB article in the WWW and I found out, that a L2TPv3 can´t Transport protocols like STP,CDP....
Is this true ? Because I found an other article where the guys run´s L2TP tunnel with MST over it....

So, what´s right now. And how can I fixed my Problem. Is AToM an alternative solution ? Works AToM with STP ?

Can someone give me a configuration example for this ? I´ve configured my last AToM/MPLS many years ago.....

Many thanks

Martin 

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