: Problem with MPLS over DSL

Hi,

I've been working on our backup link, which is a multilink PPP 
connection over a DSL link. I've gotten the basic link and stuff running 
so far, but MPLS is still giving me some headache ...

I think I have all the MTU setting correct (MTU, adjust mss, etc.), and 
am at a point where the routers just puzzle me ...

The backup link has a 7200 on each side, one with l2tp dialin, the other 
with a PA4E for PPPoE dialout. I have configured the dialin side (via 
Radius) to enable tag-switching, which works out fine:

dsl-gw.ffm#show int vi29 conf
Virtual-Access29 is an VPDN link (sub)interface

Derived configuration : 300 bytes
!
interface Virtual-Access29
  mtu 1492
  bandwidth 3072
  ip unnumbered Loopback1
  ip tcp adjust-mss 1452
  ip ospf cost 2000
  timeout absolute 50 0
  tag-switching mtu 1452
  tag-switching ip
  peer default ip address pool dsl-pool
  keepalive 60
  down-when-looped