Dell PowerConnect B-FCXs Configuration Manual page 224

5
PowerConnect B-Series FCX hitless stacking
Figure 23
priority value for two of the stack members.
FIGURE 23
Active 1 (pri=100)
Standby 2 (pri=0)
Member 3 (pri=0)
Member 4 (pri=0)
Active 1 (pri=100)
Standby 2 (pri=0)
Member 3 (pri=150)
Member 4 (pri=200)
Active 1 (pri=100)
Standby 2 (pri=0)
Member 3 (pri=150)
Member 4 (pri=200)
Active 1 (pri=100)
Member 2 (pri=0)
Member 3 (pri=150)
Standby 4 (pri=200)
Standby 1 (pri=100)
Member 2 (pri=0)
Member 3 (pri=150)
Active 4 (pri=200)
Member 1 (pri=100)
Member 2 (pri=0)
Standby 3 (pri=150)
Active 4 (pri=200)
182
illustrates a hitless stacking switchover after the network administrator increases the
Scenario 3 – Hitless stacking switchover after a priority change
FCX stack formation
Device stack priority change - Scenario 3
1
Priority 150 assigned to Unit 3 (Member 3)
Priority 200 assigned to Unit 4 (Member 4)
1
120 sec.
The priority change triggers re-election
of the Active controller
1
30 sec.
Standby re-assigned
1
60 sec.
Stage 1&2. Switchover
Switchover occurs
1
30 sec.
Standby re-assigned
1
Standby 2 becomes the Active controller
without a reload
Switchover Not allowed because priorities do not match
Standby 2 becomes the Active controller
without a reload
Switchover Not allowed because priorities do not match
Standby 4 becomes the Active controller
without a reload
Switchover Not allowed because priorities do not match
Standby 1 becomes the Active controller
without a reload
Switchover Not allowed because priorities do not match
Standby 3 becomes the Active controller
without a reload
Switchover Not allowed because priorities do not match
PowerConnect B-Series FCX Configuration Guide
53-1002266-01