With Modular Switches and SummitStack if you install two MSMs/MM or nodes in the chassis, or if you configure two master-capable nodes in a SummitStack, one assumes the role of primary (also called "master") and the other assumes the role of backup.
The primary MSM/MM or node provides all of the switch management functions including bringing up and programming the I/O modules, running the bridging and routing protocols, and configuring the switch. The primary MSM/MM or node also synchronizes the backup MSM/MM or node in case it needs to take over the management functions if the primary MSM/MM or node fails.
For SummitStack, a node can be a redundant primary node if it has been configured to be master-capable.
configure stacking [node-address node-address | slot slot-number] alternate-ip-address [ipaddress netmask | ipNetmask] gateway configure stacking redundancy [none | minimal | maximal]
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