Layer 2 tunnel on 6500

Unanswered Question
Jul 6th, 2010


We need to extend same VLAN over IP network having 6500 series switches running IOS  Version 12.2(18)SXF15a.

L2tpV3 commnads which worked  well for 3800 series routers are not supported on 6500 IOS.

Following commanfs are working on router  :

l2tp-class l2tp-defaults

retransmit initial retries 30

cookie-size 8

pseudowire-class ether-pw

encapsulation l2tpv3

protocol none

ip local interface Loopback0

interface Ethernet 0/0 ( source of the L2tpV3 tunnel )

xconnect 123 encapsulation l2tpv3 manual pw-class ether-pw (Target ip of the Tunnle switch).

l2tp id 222 111

l2tp cookie local 4 54321

l2tp cookie remote 4 12345

l2tp hello l2tp-defaults.

Tried to find the corresponding commands in the IOS but not sure how to configure the L2tpV3 or any other

tunnel that will be able to extend the same VLAN.

Any other way to configure the same VLAN extension.

Any link on is appreciated.



I have this problem too.
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Edison Ortiz Tue, 07/06/2010 - 08:11

L2TPv3 is not supported under Catalyst 6500. Catalyst 6500 only supports EoMPLS.

If you need to extend your Vlan with Catalyst 6500, you need to have a MPLS backbone between locations.



Giuseppe Larosa Tue, 07/06/2010 - 08:12

Hello Subodth,

you should consider using EoMPLS this means deploying MPLS over the IP path or to make routed links layer trunks to be able to extend vlans by simply using 802.1Q trunks ( possible if you are within a campus)

or you would need to upgrade to a later IOS version to use L2TPv3 (if ever supported like in 12.233SRE that is a C7600 ios image to be noted)

see this recent thread

Hope to help


bapatsubodh Tue, 07/06/2010 - 09:08


So in short with 6500 swithces and no-mpls backbone,  it is not possible  to extend VLAN.

Is this correct ?

We may need to connect two routers on each side which support the L2TPV3 and connect these routers to 6500.

VLAN_ABCD--R1---- 6500 -------IP connectivity ---------------6500-----R2--VLAN_ABCD

                     R1------------------- L2TPV3 -------------------------------------R2 ( loopback 0 )

             ( loopback 0)

Hope this should work



Giuseppe Larosa Tue, 07/06/2010 - 09:13

Hello Subodh,

the proposed setup may work but be aware that the routers can become bottle necks if you are attempting to extend an high traffic vlan

Hope to help


chireadorin Tue, 07/06/2010 - 15:21


   If you can't use EoMPLS, there is a trick, but depends on the purpose of the vlan extend...

You can use subinterfaces with dot1q encap between all routed links from point A to point B and then use ip directed broadcast to move the broadcast from one end to the other. Also ip helper is of use when you have to use dhcp.

I repeat. This is not the smartest, but it can be usefull without L2TP and EoMPLS and not for large vlans.


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