The apply-label per-route pop-go command configures the egress of a BGP LSP to forward a data packet received from the LSP through the outbound interface found in the ILM based on the label carried in the packet.
The undo apply-label per-route pop-go command restores the default configuration.
By default, after the egress of a BGP LSP receives a labeled data packet from the LSP, the egress removes the label of the data packet and forwards the packet based on a forwarding entry found in the IP forwarding table according to the longest-match principle.