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Can an LSR receive/transmit a labeled packet on a non-MPLS interface?

April 26, 2017interface labeled LSR non-MPLS packet transmit

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Can an LSR receive/transmit a labeled packet on a non-MPLS interface?

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A. No. Packets are never transmitted on an interface which is not enabled for that protocol. MPLS has a certain Ether type code associated with it (just as IP, IPX, and Appletalk have unique Ether types). When a Cisco router receives a packet with an Ether type which is not enabled on the interface, it drops the packet. For example, if a router receives an Appletalk packet on an interface which does not have Appletalk enabled, it drops the packet. Likewise, if an MPLS packet is received on an interface which does not have MPLS enabled, the packet is dropped.