[c-nsp] L2TPv3 "LNS mode"

[Ge Moua]

One could send this over vanilla crypto IPSec; IPSec is routable.  We 
are doing this over here.

Regards,
Ge Moua | Email: moua0100 at umn.edu

Network Design Engineer
University of Minnesota | Networking & Telecommunications Services



Gabor Ivanszky wrote:
> Hello,
>
> is there any possibility to route(L3 process) Ethernet encapsulated IP
> packets arriving at a Cisco router in a L2TPv3 tunnel?
>
> In other words, is it possible to configure a Cisco box in LNS role in
> an Ethernet L2TPv3 setup?
>
> " L2TP Network Server (LNS)
>
>      If a given L2TP session is terminated at the L2TP node and the
>      encapsulated network layer (L3) packet processed on a virtual
>      interface, we refer to this L2TP node as an L2TP Network Server" (RFC3931)
>
> Actually i'd like to implement  "(a) LAC-LNS Reference Model:
>
> On one side, the LAC receives traffic
>   from an L2 circuit, which it forwards via L2TP across an IP or other
>   packet-based network.  On the other side, an LNS logically terminates
>   the L2 circuit locally and routes network traffic to the home
>   network.  The action of session establishment is driven by the LAC
>   (as an incoming call) or the LNS (as an outgoing call).
>
>    +-----+  L2  +-----+                        +-----+
>    |     |------| LAC |.........[ IP ].........| LNS |...[home network]
>    +-----+      +-----+                        +-----+
>    remote
>    system
>                       |<-- emulated service -->|
>          |<----------- L2 service ------------>| "(RFC3931)
>
> Practically an Ethernet interface with an xconnect setting on "LAC"
> side, and something like an IP tunnel interface on the "LNS" side.
>
> The obvious
>
> interface Tunnel1
>  tunnel mode l2tpv3
>
> doesn't exist.
>
>
> cheers,
> Gabor
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