Supported Hitless Stacking Events; Non-Supported Hitless Stacking Events; Supported Hitless Stacking Protocols And Services - Arris Ruckus ICX 7850 Series Configuration Manual

• If hitless-failover enable is not configured, the following is displayed:
Standby u2 - No hitless failover. Reason: hitless-failover not configured
NOTE
Whether or not hitless-failover is enabled, if the entire stack reloads, and the active controller does not come up, the
bootup standby takes over in four minutes or longer, depending on the size of the startup-config file, to allow the active
controller sufficient time to process a very larg startup-config file during bootup. The bootup standby takes over by
reloading every unit including itself. A bootup standby is the device that was the standby controller before the reload. It
may not be the current standby controller.

Supported hitless stacking events

The following events are supported by hitless stacking:
• Failover
• Switchover
• Priority change
• Role change

Non-supported hitless stacking events

The following events are not supported by hitless stacking. These events require a software reload, affecting data traffic.
• Unit ID change - When a stack is formed or when a unit is renumbered using stack interactive-setup.
• Stack merge - When the old active controller comes back up, it reboots. If it has fewer members than the present active
controller, it loses the election, regardless of its priority. If it has a higher priority, it becomes the standby controller after
the reboot and is synchronized with the active controller. Next, a switchover occurs, and it again becomes the active
controller.
• Stack upgrade - Software cannot be upgraded on stack units without impact on traffic, unless the upgrade is performed
through ISSU. Refer to the Ruckus FastIron Software Upgrade Guide for more information.
Supported hitless stacking protocols and
services
The following table highlights the impact of a hitless switchover or failover on the major functions of the system.
Ruckus FastIron Stacking Configuration Guide, 08.0.90
Part Number: 53-1005572-01

Supported hitless stacking protocols and services

Hitless Stacking
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