[c-nsp] L2TPv3 "LNS mode"

[Gabor Ivanszky]

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