Dell PowerConnect B-FCXs Configuration Manual page 222

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