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PowerConnect B-Series FCX Configuration Guide 179
53-1002266-01
PowerConnect B-Series FCX hitless stacking
5
Figure 20 illustrates a hitless stacking switchover when the Active Controller goes down then
comes back up. The stack in this example has user-configured priorities.
FIGURE 20 Hitless stacking switchover when the Active Controller comes back up
1
1
Active (Unit 1 with priority 200)
comes back up
1
The Active controller fails
1
1
Unit 1 (priority 200) reloads because
it loses the election. After the reload,
It joins the stack as a member.
The Active controller assigns Unit 1
(priority 200) as the Standby controller.
Stages 1 and 2 are complete.
A switchover occurs. Unit 1
becomes the Active controller.
30 sec.
70 sec.
.
Active controller comes back (in a
stack with user-assigned priorities)
Active 1 (pri=200)
Standby 2 (pri=100)
Member 3 (pri=0)
Member 4 (pri=0)
Active 2 (pri=100)
Standby 3 (pri=0)
Member 4 (pri=0)
Member 1 (pri=200)
Active 2 (pri=100)
Standby 3 (pri=0)
Member 4 (pri=0)
Standby 1 (pri=200)
Active 2 (pri=100)
Member 3 (pri=0)
Member 4 (pri=0)
Active 1 (pri=200)
Standby 2 (pri=100)
Member 3 (pri=0)
Member 4 (pri=0)