Runtime Configuration Mismatch; Support During Stack Formation, Stack Merge, And Stack Split - Arris Ruckus ICX 7850 Series Configuration Manual

Hitless Stacking

Support during stack formation, stack merge, and stack split

• The runtime configuration matches that of the active controller.
If more than one unit in the stack meets these criteria, the standby controller is chosen according to the following criteria, in the
order shown:
• Priority - The unit with the highest priority value.
• Current standby - The unit that is currently the standby controller.
• Bootup master - The unit that was the active controller before the stack was reloaded.
• Bootup standby - The unit that was the standby controller before the stack was reloaded.
Once the standby controller is identified, the following internal events take place.
1. The standby controller is assigned by the active controller 30 to 60 seconds after election (60 seconds if the active
controller boots up in less than 120 seconds).
2. The standby controller receives and processes the runtime configuration sent by the active controller.
3. The standby controller learns the protocols within 70 seconds.
When the standby controller is fully synchronized, the system is ready for a switchover or failover.

Runtime configuration mismatch

In some cases, such as a runtime configuration mismatch between the active controller and candidate standby controller, the
standby controller cannot be assigned by the active controller unless the candidate standby controller is reloaded.
As shown in the following example, the show stack command output indicates whether there is a runtime configuration
mismatch.
device# show stack
alone: standalone, D: dynamic config, S: static config
ID Type
1 S ICX7750-48XGC
2 d ICX7750-48XGC
active
+---+
-2/1| 2 |2/2--2/1| 1 |2/2-
+---+
Note: There is no standby. Reason: u2: diff runtime config
Current stack management MAC is 0000.0001.0000
Note: no "stack mac" config. My MAC will change after failover.
Support during stack formation, stack merge,
and stack split
The following figure illustrates hitless stacking support during stack formation. Operational stages 1 and 2 are also shown.
178
Role MAC Address
active 0000.0001.0000
member 0000.0002.0000
+---+
+---+
Pri State Comment
30 local Ready
20 remote Ready, standby if reload
Ruckus FastIron Stacking Configuration Guide, 08.0.90
Part Number: 53-1005572-01