The Figure Upgrade sequence with MPLS-TP encryption shows the upgrade sequence for FOXMAN-UN and FOX61x to system release R18 when MPLS-TP encryption is used in the network, i.e., if you have installed DIRAC and if you are using SENC1 units in your network.

For the procedures to upgrade from R17A or R16B to R18 see details in section Upgrade R17A to R18 and section Upgrade R16B to R18.