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New Member

L2TP with VLAN Rewrite

Hello,

Due to a migration project I need to be able to migrate servers one by one from one of our offices to a new datacentre.

I've choosen L2TP in order to do this as it's supported on the equipment we have and doesn't require any special cooperation with our WAN provider. It's going well with one problem.

The problem we have is that we need to migrate multiple VLANs for which we do not have enough ports on the router to be able to do on a per-port basis, therefore we're using VLAN based sessions and trunking to the switch.When the VLANs are the same this works fine but there a couple of where the VLAN in the datacentre is different to that on the LAN and we were hoping of being able to do VLAN Rewrite as the traffic enters/leaves the tunnel.

I've used the document below as reference but it doesn't give a clear example of how do the VLAN rewrite:

http://www.cisco.com/en/US/docs/ios/ios_xe/wan/configuration/guide/wan_l2_tun_pro_v3_xe.pdf

On the switch side we are using 3750X's, at present these are just being used for Layer 2 not Layer 3.  The routers are ASR 1001's with IP Services license.

My Lab topology is as follows:

PC<---->VLAN6<----->3750x<---->ASR1<----L2TP-->ASR2<----->3750x<---VLAN4<---->PC

The config is:

!ASR1 (Datacentre)

no spanning-tree vlan 4,6

pseudowire-class l2tp

encapsulation l2tpv3

ip local interface GigabitEthernet0/0/1

!

interface GigabitEthernet0/0/1

ip address 172.23.0.1 255.255.255.0

!

interface GigabitEthernet0/0/0.2

encapsulation dot1Q 2

xconnect 172.23.0.2 2 encapsulation l2tpv3 pw-class l2tp

!

interface GigabitEthernet0/0/0.3

encapsulation dot1Q 3

xconnect 172.23.0.2 3 encapsulation l2tpv3 pw-class l2tp

!

interface GigabitEthernet0/0/0.4

encapsulation dot1Q 4

xconnect 172.23.0.2 4 encapsulation l2tpv3 pw-class l2tp

!ASR2 (Office)

no spanning-tree vlan 4,6

pseudowire-class l2tp

encapsulation l2tpv3

ip local interface GigabitEthernet0/0/1

!

interface GigabitEthernet0/0/1

ip address 172.23.0.2 255.255.255.0

!

interface GigabitEthernet0/0/0.2

encapsulation dot1Q 2

xconnect 172.23.0.1 2 encapsulation l2tpv3 pw-class l2tp

!

interface GigabitEthernet0/0/0.3

encapsulation dot1Q 3

xconnect 172.23.0.1 3 encapsulation l2tpv3 pw-class l2tp

!

interface GigabitEthernet0/0/0.6

! Trying to do VLAN rewrite

encapsulation dot1Q 6

xconnect 172.23.0.1 4 encapsulation l2tpv3 pw-class l2tp

The tunnels all appear to be up fine:

#show l2tun

L2TP Tunnel and Session Information Total tunnels 1 sessions 3

LocTunID   RemTunID   Remote Name   State  Remote Address  Sessn L2TP Class/

                                                           Count VPDN Group

2665053201 3580733410 R01 est    172.23.0.1      3     l2tp_default_cl

LocID      RemID      TunID      Username, Intf/      State  Last Chg Uniq ID

                                 Vcid, Circuit

3228838299 3330464863 2665053201 2, Gi0/0/0.2:2       est    00:13:19 0

3156076578 870942034  2665053201 3, Gi0/0/0.3:3       est    00:13:19 0

3618643402 1760691600 2665053201 4, Gi0/0/0.6:4       est    00:13:19 0

Would really appreciate if anyone could explain where I'm going wrong.

Thanks

Lee

  • LAN Switching and Routing
Everyone's tags (5)
3 REPLIES
Cisco Employee

L2TP with VLAN Rewrite

Hi Lee,

What VLAN ID are you changing to? You have VLAN 2,3,4 configured on both end?

HTH,

Lei Tian

New Member

L2TP with VLAN Rewrite

On the Office side in the example I'm trying to rewrite VLAN 6 to VLAN 4 at the Datacentre. Thanks

New Member

Re:L2TP with VLAN Rewrite

The local interface is supposed to be a loopback. Probably not the problem but better to follow the instructions. I'm guessing that the interfaces shown are not on a supported port adapter. Other than that it looks ok, what does a show l2tun tunnel all show?



Sent from Cisco Technical Support Android App

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