NE40 PPPoX/IPoX L2VPN - how to retagging customer from different VPLS -

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Hi Dear,

No. this is an invalid configuration, because of the error clearly says, you cannot have same vlan assigned to different sub-interfaces of same main interface. And obvious reason is that, main interfaces sees the vlan id 814 of the receiving packet to judge on which sub-interface it actually received the packet.

If two subinterfaces use same vlan, it would be impossible for the router to know / understand on which sub-interface it received the packet.


interface Virtual-Ethernet0/1/100.1 configured with tag value 814, &
interface Virtual-Ethernet0/1/100.2 configured with tag value 814, no two logical interfaces can have same tag value. This is invalid configuration.

Hope it will helpful.

Hello, thankyou for your answer!
Yes, the configuration is invalid, I understand that is a general rule that different subinterfaces are unable to match the same tag. The question for me is how to avoid that, I mean, my customer use always vlan 814, in the CPE at the home. So I have MPLS L2VC all with the same VLAN but coming from different location, so different MPLS circuits. I need to retag the 814 from my customer in order to accomodate them in a different subinterface. So I need to take the 814 retag in order to avoid the conflict.

I'm doing a migration from a Cisco device where I do something like this:
!
interface TenGigE0/0/2/1.2 l2transport
encapsulation dot1q 157
rewrite ingress tag translate 1-to-1 dot1q 814 symmetric
!
as you see I remove the 814 and insert the 157 so I can have many subinterfaces. I know that this is a l2 interface, but this is an example.

Hi,
It's easy to find the same configuration of your example:
interface G0/0/1
port vlan-mapping vlan 814 map-vlan 157

What I'm doubted is that whether the CE with the same VLAN ID can be identified on the PE router. As far as my understanding, you connect the multi CEs to the PE same physical interface, which means that there should be a switch between the PE and CEs so that the multi CEs can be integrated into a single wire. In that situation, I would suggest that you configure VLAN mapping on the switch to translate the same CE VLAN to the different VLANs, or QinQ to encapsulate the CE VLAN in the different outer VLAN tags.

Interesting. Thank you for sharing.