High Availability On S-Series Stacks - Dell Force10 S4810P Configuration Manual

Figure 47-4. S4810 supported stacking topologies

High Availability on S-Series Stacks

S-Series stacks have master and standby management units analogous to Dell Force10 Route Processor
Modules (Figure 47-5). The master unit synchronizes the running configuration and protocol states so that
the system fails over in the event of a hardware or software fault on the master unit. In such an event, or
when the master unit is removed, the standby unit becomes the stack manager and FTOS elects a new
standby unit. FTOS resets the failed master unit: once online, it becomes a member unit; the remaining
members remain online.
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