Optimal Service Upgrade Limitations
Implement the Optimal Service Upgrade procedure when there is minimal network traffic.
The Optimal Service Upgrade procedure does not provide redundancy, if a Cluster Member fails during the upgrade.
Do not make configuration changes during the upgrade process.
Optimal Service Upgrade does not support:
VPN connections
Dynamic Routing connections
Complex connections
For example: DHCP, DCE RPC, SUN RPC, Back Web, IIOP, FreeTel, WinFrame, NCP
Bridge mode (Layer 2) configuration