Ethernet over MPLS

Unanswered Question
Dec 9th, 2009

Hi Everybody!

I have question: when a VC is configured on an interface, does routing protocols are disabled on this interface?

Thank You,


I have this problem too.
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Nagendra Kumar ... Wed, 12/09/2009 - 01:33


AFAIK, xconnect cannot be configured on an interface with IP address.

If you try xconnect with IP address configured on an interface, error message will be seen as below,

R1(config-subif)#int e0/2
R1(config-if)#ip addr
R1(config-if)#xconnect 123 encapsulation mpls
Incompatible with ip address command on Et0/2 - command rejected.
R1(config-if)#no ip addr           
R1(config-if)#xconnect 123 encapsulation mpls

So obviously it cannot participate in routing protocol as it doesnt have IP address.



Giuseppe Larosa Wed, 12/09/2009 - 05:11

Hello Agata,

you can have routed subinterfaces, EoMPLS subinterfaces, subinterfaces in VRF under the same main interface but a single interface cannot be at the same a L2 facing point and a L3 interface as Nagendra has showed.

Using subinterfaces can give a chance to provide L2 and L3 services for different vlan-ids

Hope to help



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