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Build Stacks
Table 15: List of Stacking Terms (continued)
Term
Failover
Hitless failover
Node address
Node role election
Node role election priority A priority assigned to each node, to be used in node role election. The
Operational node
System uptime
Stack segment
Stack state
Easy Setup
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 different switch models in a stack
•
Information about stacking cables
Description
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.
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.
The unique MAC address that is factory-assigned to each node.
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 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.
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.
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.
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.
A state assigned by the stack to a node. You can display the stack state by
entering the show stacking command.
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 effect.
The choice to run Easy Setup is offered 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.
ExtremeSwitching 5720 Series Hardware Installation Guide
Plan to Create Your Stack
47
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