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

[Rado Vasilev]

Hi group,

 

I'm trying to configure a 7206VXR as a LAC (L2TP Access Concentrator)
without any success.

Here's my testlab setup - any view of what I might be doing wrong much
appreciated!

 

 

 

DSL modem configured with PPPoE and username rado at deckland.com is connected
to a Layer2 transparent DSLAM.

DSLAM port is mapped to vlan 5 which is terminated with a subinterface on
the 7206.

 

If I configure the router as LNS (vpdn group and virtual template
interface), the PPPoE session gets locally terminated

and I have connectivity to the modem. This basically proves the VLAN
connectivity from the DSLAM port to the Cisco router.

What my end goal is to use the device as LAC and not LNS. I have a second
router that's already configured as LNS and

this is where I want the PPP session terminated at.

 

 

 

[DSL modem] <-- dsl_line ---> [vlan_5 DSLAM dot1q_trunk] <--- uplink --->
[fa2/0.5 C7206VXR fa0/0] <--- IP ---> [LNS router]

 

Here's my configuration on the 7206:

 

------------------ 7206 conf -------------------

 

hostname lac

 

aaa new-model

aaa authentication login default local

aaa authentication ppp default local

aaa authorization network default local

 

vpdn enable

vpdn search-order domain dnis

 

vpdn-group 1

 request-dialin

  protocol l2tp

  domain deckland.com

 initiate-to ip 2.2.2.2

 no l2tp tunnel authentication

 

! 2.2.2.2 is the IP of the remote LNS server

 

interface FastEthernet2/0.5

 description PPPoE Test

 encapsulation dot1Q 5

 pppoe enable

 pppoe max-sessions 100

 

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

 

 

The above configuration basically tries to manually establish L2TP tunnel to
the remote LNS.

Debbuging while the modem tries to connect shows in the logs:

 

*Mar  4 02:49:33.531: PPPoE 0: I PADI L:ffff.ffff.ffff R:0002.cf65.e602 5
Fa2/0.5

*Mar  4 02:49:33.531: PPPoE 0: No info L:ffff.ffff.ffff R:0002.cf65.e602 5
Fa2/0.5

*Mar  4 02:49:41.531: PPPoE 0: I PADI L:ffff.ffff.ffff R:0002.cf65.e602 5
Fa2/0.5

*Mar  4 02:49:41.531: PPPoE 0: No info L:ffff.ffff.ffff R:0002.cf65.e602 5
Fa2/0.5

*Mar  4 02:49:57.535: PPPoE 0: I PADI L:ffff.ffff.ffff R:0002.cf65.e602 5
Fa2/0.5

*Mar  4 02:49:57.535: PPPoE 0: No info L:ffff.ffff.ffff R:0002.cf65.e602 5
Fa2/0.5

*Mar  4 02:49:59.531: PPPoE 0: I PADI L:ffff.ffff.ffff R:0002.cf65.e602 5
Fa2/0.5

 

It looks that Cisco doesn't want to respond on the incoming PADI messages...

 

sh version

Cisco Internetwork Operating System Software

IOS (tm) 7200 Software (C7200-JK9S-M), Version 12.2(46a), RELEASE SOFTWARE
(fc1)

Copyright (c) 1986-2007 by cisco Systems, Inc.

Compiled Thu 12-Jul-07 00:38 by pwade

Image text-base: 0x60008940, data-base: 0x617A4110

 

ROM: System Bootstrap, Version 12.0(19990210:195103) [12.0XE 105],
DEVELOPMENT SOFTWARE

BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(10)S, EARLY DEPLOYMENT
RELEASE SOFTWARE (fc1)

 

d-magneto-pe1 uptime is 18 hours, 45 minutes

System returned to ROM by reload at 08:04:11 UTC Mon Mar 3 2008

System image file is "slot1:c7200-jk9s-mz.122-46a.bin"

 

 

 

Any help appreciated!

Rado

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