[rbak-nsp] Mirror L2TP traffic?

[Jim Tyrrell]

Is it possible to mirror L2TP traffic on a dot1q interface?

I have been mirroring subscriber traffic no problem, but now I want to 
mirror the actual L2TP traffic so I can check QoS propogation is 
working.  I have configured a mirror policy on the dot1q PVC but I dont 
see the subscribers L2TP packets, all I see is the keepalive chatter etc 
between LNS and LAC's.

Basic config is:

----------------------------------------------------------
tunnel gre MirrorTunnel
  peer-end-point local x.x.x.x remote z.z.z.z
  bind interface SubTrafficMirror traffic-mirror-gre
  log-state-changes
   forward output SubMirrorDest

context traffic-mirror-gre
!
  interface SubTrafficMirror
   description GRE Tunnel to Linux server traffic mirroring
   ip address 10.0.0.1/30

port ethernet 4/4
  dot1q pvc 2009
   description Link to Supplier LACs
   bind interface supplier1a ContextX
   forward policy MirrorL2TPtraffic out

forward policy MirrorL2TPtraffic
  mirror destination SubMirrorDest all

----------------------------------------------------------

I have tried specifying 'ip-datagrams' and 'l2-frames' in the forwarding 
policy.  Is it not possible for mirror this type of traffic?

Thanks.

Jim.