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180 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
PowerConnect B-Series FCX hitless stacking
5
Figure 21 illustrates a hitless stacking switchover after the network administrator increases the
priority value of the Standby Controller.
FIGURE 21 Scenario 1 – Hitless stacking switchover after a priority change
1
1
1
1
120 sec.
Standby 2 becomes the Active controller
without a reload.
Not allowed because priorities do
not match.
Priority 200 assigned to Unit 2 (Standby)
The priority change triggers re-election
of the Active controller
The Standby controller is re-assigned
and a switchover occurs.
Stages 1 and 2 are bypassed.
Standby 1 (pri=100)
Active 2 (pri=200)
Member 3 (pri=0)
Member 4 (pri=0)
Active 1 (pri=100)
Standby 2 (pri=200)
Member 3 (pri=0)
Member 4 (pri=0)
Active 1 (pri=100)
Standby 2 (pri=200)
Member 3 (pri=0)
Member 4 (pri=0)
Active 1 (pri=100)
Standby 2 (pri=0)
Member 3 (pri=0)
Member 4 (pri=0)
60 sec.
Switchover
Failover
Standby 2 becomes the Active controller
without a reload.
Not allowed because priorities do
not match.
Switchover
Failover
FCX stack formation
Device stack priority change - Scenario 1