Unified ISSU Feature Support

Unified ISSU supports most JUNOS software features in JUNOS Release 9.0. However, the following constraints apply:

Link Aggregation Control Protocol (LACP)—Link changes are not processed until after the unified ISSU is complete.
Automatic Protection Switching (APS)—Network changes are not processed until after the unified ISSU is complete.
Ethernet Operation, Administration, and Management (OAM) as defined by IEEE 802.3ah and by IEEE 802.1ag—When a Routing Engine switchover occurs, the OAM hello times out, triggering protocol convergence.
Ethernet circuit cross-connect (CCC) encapsulation—Circuit changes are not processed until after the unified ISSU is complete.
Logical Systems—Logical system configurations are not supported by unified ISSU.