Extreme Networks ExtremeSwitching 5720 Series - Plan to Create Your Stack

Table 15: List of Stacking Terms (continued)
Term Description
Failover The process of changing the backup node to the primary node when the
original primary node has failed.
When a primary node fails, if a backup node is present, and if that node
has completed its initial synchronization with the primary node, then the
backup node assumes the role of primary node. The standby nodes
continue their operation and their data ports do not fail.
Hitless failover A failover in which all data ports in the stack, except those of the failing
primary node, continue normal operation when the primary node fails.
Node address The unique MAC address that is factory-assigned to each node.
Node role election The process that determines the role for each node. The election takes
place during initial stack startup and elects one primary node and one
backup node. An election also takes place after a primary node failover,
when a new backup node is elected from the remaining standby nodes.
Node role election priority A priority assigned to each node, to be used in node role election. The
node with the highest node role election priority during a role election
becomes the primary node. The node with the second highest node role
election priority becomes the backup.
Operational node A node that has achieved operational state as a card in a slot. The
operational state can be displayed using the show slot {slot
{detail} | detail }command.
System uptime The amount of time that has passed since the last node role election. You
can display the system uptime by entering the show switch
{detail } command on the primary node.
Stack segment A collection of nodes that form a stack topology. The term is useful when
a stack is severed. Each severed portion of the stack is referred to as a
stack segment.
Stack state A state assigned by the stack to a node. You can display the stack state by
entering the show stacking command.
Easy Setup A procedure that automatically configures the essential stacking
parameters on every node for initial stack deployment, and then
automatically reboots the stack to put the parameters into eect.
The choice to run Easy Setup is oered when you run the enable
stacking {node-address node-address} command and the
essential stacking parameters are unconfigured or inconsistent. It can also
be invoked directly by running the configure stacking easy-
setup command.
Plan to Create Your Stack
Use the information in the following topics to plan the physical makeup of your stack – switches,
versatile interface modules (VIMs), and cables – and the stacking protocols you will use. Included are:
• Guidelines and other information for each switch model in your stack
• Considerations for combining dierent switch models in a stack
• Information about stacking cables
Build Stacks
Plan to Create Your Stack
ExtremeSwitching 5720 Series Hardware Installation Guide 47