Need help troubleshooting an L2TPv3 tunnel

Unanswered Question
Jun 13th, 2008

I've got a project I'm trying to use an l2tpv3 tunnel for. The tunnel seems to establish just fine, but it doesn't seem to do quite what I expected it to do. I'm trying to access vlans on a remote site that's connected via ATM. The remote side is connected by a 3640 router, plus a 8510 switch. On the local side, I've got another 3640, plus a 3500 switch.

As a possible clue, doing a 'show vlans' shows many packets output, but only a few input on the local side. On the remote side, the counts are zero in and out.

Here is a piece of the config on both sides. There is a vlan 77 on the network connected to f0/0 on the remote side that I'd like to be able to assign to the network connected to f0/0 on the local side.

Thanks!

--Steve

===========

remote side

===========

l2tp-class l2-dyn

hostname ABC

password <password>

cookie size 8

!

pseudowire-class pw-dynamic

encapsulation l2tpv3

protocol l2tpv3 l2-dyn

ip local interface FastEthernet0/0

!

interface FastEthernet0/0

ip address 10.77.0.1 255.255.0.0

no ip redirects

no ip proxy-arp

ip pim sparse-mode

ip route-cache flow

speed 100

full-duplex

!

interface FastEthernet0/0.77

encapsulation dot1Q 77

no snmp trap link-status

no cdp enable

xconnect 10.52.0.10 77 pw-class pw-dynamic

!

interface ATM1/0.2 multipoint

bandwidth 2284

ip address 10.99.60.77 255.255.255.0

ip pim sparse-mode

no ip mroute-cache

pvc data 0/277

protocol ip 10.99.60.1 broadcast

ubr 2284

broadcast

encapsulation aal5snap

!

!

==========

local side

==========

l2tp-class l2-dyn

hostname ADM

password <password>

cookie size 8

!

pseudowire-class pw-dynamic

encapsulation l2tpv3

protocol l2tpv3 l2-dyn

ip local interface FastEthernet0/0

!

interface FastEthernet0/0

no ip address

duplex auto

speed auto

!

interface FastEthernet0/0.77

encapsulation dot1Q 77

no snmp trap link-status

no cdp enable

xconnect 10.77.0.1 77 pw-class pw-dynamic

!

interface FastEthernet2/0

no ip address

no ip redirects

no ip proxy-arp

ip pim sparse-mode

duplex auto

speed auto

!

interface FastEthernet2/0.52

encapsulation dot1Q 52 native

ip address 10.52.0.10 255.255.0.0

no snmp trap link-status

!

I have this problem too.
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Giuseppe Larosa Sun, 06/15/2008 - 01:11

Hello Steve,

first of all I would suggest you to move the L3 config to a subinterface instead of using the main physical interface at the remote site, just to be sure on the remote-site that different 802.1Q tags are used for frames of the vlan 77 and for frames of the routed vlan used as endpoint of the l2tvp3 trunk.

Have you got a trunk link to a switch port on the remote site ?

What is the native vlan on that trunk ?

If the native vlan is 77 on the switch side or the switch port is in access mode, you cannot see frames on vlan 77 on the router.

I would suggest to use loopback addresses as endpoints of the tunnel.

If the tunnel comes up but no traffic is flowing you may face a forwarding problem so leave the main interface not configured

hope to help

Giuseppe

hennigan Sun, 06/15/2008 - 05:50

On the local side under the pseudowire you have:

ip local interface FastEthernet0/0

but your FastEthernet0/0 has no IP address.

I think you want the pseudowire to instead have an IP local of FastEthernet2/0.52

Better yet, tie the tunnel to loopback interfaces.

joealbergo Sat, 06/05/2010 - 11:53

SP,

Whatever happened with this?

I don't see to much information about L2TPv3.

I am currently studying this ----

Hope to hear from you.

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