The MPLS-OPS Archive

["Sudha" <sudha.r@ddsl.net>]

Hi Garry,

    I came to know that MPLS will not work in Multilink PPP from an MPLS trainer from Datacraft.

Anyway u can double confirm..

 

Regards.

Sudha.

 

----- Original Message -----

From: Mansoor Khan

To: Garry Glendown ; mpls-ops@mplsrc.com

Sent: Monday, February 07, 2005 5:26 PM

Subject: RE: [MPLS-OPS]: Problem with MPLS over DSL

Hi Garry,

Try changing the tag-switching mtu to 1526

Cheers,

MK

-----Original Message-----
From: Garry Glendown [mailto:garry@regio.net]
Sent: 6/Feb/2005 12:00 AM
To: mpls-ops@mplsrc.com
Subject: [MPLS-OPS]: 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 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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