H3C S5120-EI Series Operation Manual page 1140

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IRF Stack Configuration
When configuring IRF stack, go to these sections for information you are interested in:
IRF Stack Overview
IRF Stack Working Process
IRF Stack Configuration Task List
Configuring IRF Stack
Logging In to an IRF Stack
Displaying and Maintaining IRF Stack
IRF Stack Configuration Example
IRF Stack Overview
Introduction
Intelligent Resilient Framework (IRF) allows you to build an IRF stack, namely a united device, by
interconnecting multiple devices through stack ports. You can manage all the devices in the IRF stack
by managing the united device.
In an IRF stack, every single device is a stack member, and plays one of the following two roles
according to its function:
Master: A stack member. It is elected to manage the entire stack. An IRF stack has only one master
at one time.
Slave: A stack member. It is managed by the master and operates as a backup of the master. In an
IRF stack, except for the master, all the other devices are the slaves.
Role election defines the roles of stack members and is discussed in a later section.
Stack Connections
Pysical stack port
To make an IRF stack operate normally, you need to connect the stack members physically. Physical
ports that are dedicated to stack connection on devices are called physical stack ports. For the
S5120-EI series, the 10 GE interface modules can be inserted into the expansion module slots on the
rear panel of the switch to provide physical stack ports. The following 10 GE interface modules can be
used to provide physical stack ports:
One-port 10 GE XFP interface module
Dual-port 10 GE XFP interface module
Short-haul dual-port 10 GE CX4 interface module
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