Dell PowerConnect B-FCXs, Configuration Manual

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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)
come
s b a ck u p
1
The Active controller f a il s
1
1
Unit 1 (priority 200) relo a d s bec aus e
it lo s e s the election. After the relo a d,
It join s the s t a ck as a member.
The Active controller ass ign s Unit 1
(priority 200) as the St a ndby controller.
St a ge s 1 a nd 2 a re complete.
A s witchover occ u r s . Unit 1
become s the Active controller.
30 s ec.
70 s ec.
.
Active controller come s b a ck (in a
s t a ck with us er- ass igned prioritie s )
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)