Pre-upgrade steps
Before starting the node upgrade, perform the following steps:
1 MPLS Service migration: MPLS services without control word (if there are any) must be migrated to services with control word. Control word shall be migrated before upgrading the nodes, else there is a risk to lose packets due to time stamping non PTP packets on SENC1 or EPEX1 units. It is recommended to do this step even if you currently do not operate SENC1 or EPEX1 units.
Therefore, execute the script “Set PW Control Word” from the FOXMAN-UN - R18 “NEM Desktop - System - Remote Executor...”. Execute the script service by service, node by node or network-wide, as preferred.
After upgrading to R18, packets without PW control word may get time stamped even they are not PTP packets, this may result in packet loss.
Make sure that ENP services are in valid state before starting the service migration with the Remote Executor tool.
2 Make sure that gateway address for static routes and for default routes are not identical to the IP address of the local management interface, else you may risk to lose connectivity to the network. If the addresses are identical, reconfigure them before starting the upgrade procedure.