BGP labeled unicast supports stack of labels

Junos OS supports RFC 3107, Carrying Label Information in BGP-4, that allows stacking of multiple labels in the BGP labeled unicast. In earlier Junos OS Releases, only one label per prefix was supported in the BGP unicast label. Junos OS now supports a label stack of up to five labels per prefix in the BGP labeled unicast updates. BGP labeled unicast updates with more than five labels are not supported and Junos OS sets their state to hidden. This feature allows the use of BGP unicast label stack to control packet forwarding in the network and to reflect the BGP unicast label stack routes to its clients without changing the next hop.