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ML-PPP using two DSL lines (over L2TP)

--begin ciscomoderator note-- The following post has been edited to remove potentially confidential information. Please refrain from posting confidential information on the site to reduce security risks to your network. -- end ciscomoderator note --

Hi there,

I am trying to configure a ML-PPP setup between a Cisco 1721 CPE (thru a Redback as the LAC) to a Cisco 2621XM acting as the LNS.

I have managed to get the multilink connection to establish, however when I try to run traffic through the bundle I get a lot of MLP out-of-sequence errors. As follows:

00:39:01: Mu1 MLP: Lost fragment 167 in 'nms-cll' (all links have rcvd higher seq#)

00:39:01: Mu1 MLP: Received lost fragment seq 168, expecting 16D in 'nms-cll'

00:39:01: Mu1 MLP: Out of sync with peer, resyncing to last rcvd seq# (000168)

00:39:01: Mu1 MLP: Unusual jump in seq number, from 00016D to 000169

00:39:01: Mu1 MLP: Lost fragment 169 in 'nms-cll' (all links have rcvd higher seq#)

00:39:01: Mu1 MLP: Lost fragment 16B in 'nms-cll' (all links have rcvd higher seq#)

Does any know how to overcome this problem? I have tried to increase the 'ppp multilink fragment delay' variable but it doesn't seems to work.

One WIC is a ADSL and the other is G.SHDSL.

I thought ML-PPP was suppose to have the capability of handle different media types (ie, latency, bandwidth and so on)?

Here are the config at the CPE (Cisco 1721):

multilink virtual-template 1

!

!

!

interface Multilink1

ip address negotiated

ip nat outside

no cdp enable

ppp direction callout

ppp multilink

ppp multilink fragment-delay 1000

ppp multilink interleave

no ppp multilink fragmentation

multilink-group 1

!

interface ATM0

bandwidth 2000

no ip address

load-interval 60

shutdown

no atm ilmi-keepalive

dsl equipment-type CPE

dsl operating-mode GSHDSL symmetric annex B

dsl linerate AUTO

!

interface ATM0.38 point-to-point

pvc shdsl-line 0/38

oam-pvc manage

protocol ppp Virtual-Template1

!

!

interface ATM1

no ip address

load-interval 60

shutdown

no atm ilmi-keepalive

dsl operating-mode auto

!

interface ATM1.38 point-to-point

pvc adsl-line 0/38

oam-pvc manage

protocol ppp Virtual-Template1

!

!

interface Virtual-Template1

no ip address

ppp authentication chap callin

ppp chap hostname xxxxxxxxxxxxxx

ppp chap password 7 xxxxxxxxxxxxxx

ppp direction callout

ppp multilink

ppp multilink endpoint hostname

multilink min-links 2

multilink-group 1

!

ip nat inside source list 10 interface Multilink1 overload

ip classless

ip route 0.0.0.0 0.0.0.0 Multilink1

===============================================

Here are the config at the LNS (Cisco 2621XM):

!

username xxxxxxxxxxxxxx password 7 xxxxxxxxxxxxxx

username user2@test.bddsl.com password 7 xxxxxxxxxxxxxx

!

vpdn enable

!

vpdn-group 1

accept-dialin

protocol l2tp

virtual-template 1

terminate-from hostname xxxxxxxxxxxxxxx

local name bulldog_lns_01

lcp renegotiation always

l2tp tunnel password 7 xxxxxxxxxxxxxx

source-ip 192.168.7.1

!

interface Virtual-Template1

ip address xxx.xxx.xxx.201 255.255.255.248

peer default ip address pool lns_pool_public

ppp authentication chap

ppp ipcp dns xxx.xxx.xxx.2 xxx.xxx.xxx.3

ppp multilink

ppp multilink fragment-delay 1000

ppp multilink interleave

ppp multilink endpoint hostname

multilink min-links 1

no ppp multilink fragmentation

!

ip local pool lns_pool_public xxx.xxx.xxx.202 xxx.xxx.xxx.207

1 REPLY
Bronze

Re: ML-PPP using two DSL lines (over L2TP)

Try removing the multilink interface on the 1700. Just use the virtual template.

int virtual-template 1

ip add neg

no multilink-group 1

Remember to change the route and the NAT to reflect the template as well.

Daniel

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