[cisco-bba] Cisco as L2TP Access Concentrator (LAC)

Rado Vasilev rado at dev.magnet.ie
Tue Mar 4 10:25:09 EST 2008

Hi Oliver,

Thanks for your help - I got it working now!!!

--- Minimal Cisco LAC configuration ---

aaa new-model
aaa authentication login default local
aaa authentication ppp default local

vpdn enable
vpdn multihop
vpdn-group 1
  protocol pppoe
  virtual-template 1

vpdn-group 2
  protocol l2tp
  domain deckland.com
 initiate-to ip
 local name deckland.com
 no l2tp tunnel authentication

interface FastEthernet2/0.5
 description PPPoE Test
 encapsulation dot1Q 5
 pppoe enable
 pppoe max-sessions 100

interface Virtual-Template1
 description PPPoE Test
 ip unnumbered Loopback1
 keepalive 30
 ppp authentication chap


lac#sh vpdn tunnel

L2TP Tunnel Information Total tunnels 1 sessions 1

LocID RemID Remote Name   State  Remote Address  Port  Sessions
21754 33850 d-test-lns1    est     1701  1

lac#sh users
    Line       User       Host(s)              Idle       Location
*  2 vty 0     admin      idle                 00:00:00

  Interface      User        Mode                     Idle     Peer Address
  Vi1          rado at deckl Virtual PPP (PPPoE ) 00:00:00


-----Original Message-----
From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com] 
Sent: 04 March 2008 14:04
To: Rado Vasilev; cisco-bba at puck.nether.net
Subject: RE: [cisco-bba] Cisco as L2TP Access Concentrator (LAC)

Rado Vasilev <mailto:rado at dev.magnet.ie> wrote on Tuesday, March 04,
2008 2:47 PM:

> Hi Oliver,
> I added the global configuration command ``vpdn multihop'' but that
> didn't help.
> Did you mean to recommend some additional command(s) under the
> vpdn-group too?

Well, I meant to configure a pppoe vpdn-group (or bba-group, depending
on version) and a virtual-template just as you did initially (you
mentioned that you successfully terminated the pppoe sessions on the
7200). This is required to accept pppoe sessions. The "vpdn multihop"
along with the addtl. vpdn-group will take care of L2TP forwarding. 
So the 7200 will act as LNS as well as LAC (sometimes referred to as
"multihop LNS")..

you might want to consider upgrading to 12.3M or 12.4M to get addtl.
functionality for this type of application..



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