Configuration Guide User guide

FastIron Configuration Guide 347
53-1002494-02
Hitless stacking
Figure 28 illustrates a hitless stacking switchover after the network administrator increases the
priority value of the Standby Controller.
FIGURE 28 Scenario 1 – Hitless stacking switchover after a priority change
1
1
1
1
120 sec.
Standby 2 becomes the Active controller
without a reload.
Not allowed because priorities do
not match.
Priority 200 assigned to Unit 2 (Standby)
The priority change triggers re-election
of the Active controller
The Standby controller is re-assigned
and a switchover occurs.
Stages 1 and 2 are bypassed.
Standby 1 (pri=100)
Active 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)
Active 1 (pri=100)
Standby 2 (pri=200)
Member 3 (pri=0)
Member 4 (pri=0)
Active 1 (pri=100)
Standby 2 (pri=0)
Member 3 (pri=0)
Member 4 (pri=0)
60 sec.
Switchover
Failover
Standby 2 becomes the Active controller
without a reload.
Not allowed because priorities do
not match.
Switchover
Failover
FCX stack formation
FCX stack priority change - Scenario 1