Hitless Stacking Switchover - Dell PowerConnect B-FCXs Configuration Manual

5
PowerConnect B-Series FCX hitless stacking
Hitless stacking failover example
Figure 18
FIGURE 18

Hitless stacking switchover

Hitless stacking switchover is a manually-controlled (CLI-driven) or automatic switchover of the
Active and Standby Controllers without reloading the stack and without any packet loss to the
services and protocols that are supported by hitless stacking. A switchover is activated by the CLI
command stack switch-over. A switchover might also be activated by the CLI command priority,
depending on the configured priority value.
By default, hitless switchover is not allowed. The default behavior is described in
default behavior"
Hitless switchover can be used by a system administrator, for example, to perform maintenance on
a controller that has been functioning as the Active Controller.
For a description of the events that occur during a hitless stacking switchover, refer to
happens during a hitless stacking switchover or failover"
176
illustrates hitless stacking failover operation when the Active Controller fails.
Hitless stacking failover when the Active Controller fails
The stack comes back without the Active controller
Active 1
Member 2 = bootup Standby
1
Member 3
Member 4
Member 2 = bootup Standby
1
Member 3
Member 4
The bootup Standby will become the Active controller
in 50 seconds. The stack will not reload.
Active 2
1
Member 3
Member 4
Active 2
1
Standby 3
Member 4
on page 173.
.
The Active controller fails
after the stack reloads
50 sec.
30-60 sec.
on page 166.
PowerConnect B-Series FCX Configuration Guide
"Hitless stacking
"What
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