Configure MPLS VPN on Ethernet VLAN interfaces

Configure MPLS VPN on Ethernet VLAN interfaces

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Subject Author Date
Configure MPLS VPN on Ethernet VLAN interfaces FX 06-15-2008
Posted by FX on June 15, 2008, 10:35 am
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I created Ethernet subinterfaces with VLAN and isl/dot1q
encapsulation.
then i tried Applying VRF (part of MPLS VPN) to it, and it worked
without giving error.
But I believe, VPN isnt supported on VLAN interfaces.. it doesnt make
sense to have L3 tunneling inside L2.
I dont know if this configuration works in real, but it is accpeted by
cisco CLI.

Any ideas?

NMFall 20%
Posted by Thrill5 on June 15, 2008, 11:33 pm
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VRF's are used to create independent routing instances. Each VRF has its
own routing table and VRF's don't mix or share routes. They are supported
on VLAN, dot1q, and physical interfaces on versions of IOS that support
VRF's. MPLS networks add a "tag" to the packets which identify the VRF the
encapsulated packet belongs to. Without VRF's, VPN's wouldn't work but I
suspect that what you have configured is not going to work the way you
think.

>I created Ethernet subinterfaces with VLAN and isl/dot1q
> encapsulation.
> then i tried Applying VRF (part of MPLS VPN) to it, and it worked
> without giving error.
> But I believe, VPN isnt supported on VLAN interfaces.. it doesnt make
> sense to have L3 tunneling inside L2.
> I dont know if this configuration works in real, but it is accpeted by
> cisco CLI.
>
> Any ideas?



Posted by Stephen on June 16, 2008, 5:58 pm
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wrote:

>I created Ethernet subinterfaces with VLAN and isl/dot1q
>encapsulation.
>then i tried Applying VRF (part of MPLS VPN) to it, and it worked
>without giving error.

what you probably have is each vlan can be bound as an interface to a
VRF.

>But I believe, VPN isnt supported on VLAN interfaces.. it doesnt make
>sense to have L3 tunneling inside L2.

what you have is vlans which are logical interfaces to the different
emulated routers in each VRF.

FWIW the way we support multiple VPNs to a site with Ethernet WAN
access is to extend each VRF from PE to CE as a different VLAN tag

>I dont know if this configuration works in real, but it is accpeted by
>cisco CLI.

it does work. it does not need VPNs or MPLS to be useful.

>
>Any ideas?

for example we run management in 1 VRF in a L3 switch, and customer
traffic in another.
2 logical routing instances in different VRFs, with different routing
tables.
--
Regards

stephen_hope@xyzworld.com - replace xyz with ntl

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