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Problem with MPLS over DSL

  • From: Garry Glendown <garry@regio.net>
  • Date: Sun, 06 Feb 2005 01:42:55 +0100
  • Resent-Date: Sat, 5 Feb 2005 19:43:39 -0500
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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
  ppp authentication chap pap callin
end
(+ same for the currently second link)

dsl-gw.ffm#show tag-switching interfaces
Interface              IP            Tunnel   Operational
FastEthernet0/0        Yes (tdp)     No       Yes
Virtual-Access29       Yes (tdp)     No       Yes
Virtual-Access59       Yes (tdp)     No       Yes

Question: When does a Cisco say the tdp is operational? On the other 
side, I configured the dialer to use mpls:

interface Dialer2
  mtu 1492
  bandwidth 2048
  ip address 1.2.3.4 255.255.255.252
  ip load-sharing per-packet
  encapsulation ppp
  no ip route-cache
  ip tcp adjust-mss 1452
  ip ospf cost 2000
  no ip mroute-cache
  dialer pool 2
  dialer-group 2
  tag-switching mtu 1452
  tag-switching ip

Anyway, it is left not operational:

Interface              IP            Tunnel   Operational
FastEthernet1/0        Yes (tdp)     No       Yes
Dialer2                Yes           No       No

I've tried several debug mpls options, but can't seem to find a reason 
why it's not working ...

Anybody have an idea?

Help appreciated, -gg

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