H3C S5120-EI Series - Drawing a Plan for the Switch Stack

3-21
No Task Remarks
6
Configure software for the switch
stack
For details about the IRF stack function, see IRF
Stack Configuration in the System Volume of the H3C
S5120-EI Series Ethernet Switches Operation
Manual.
7 Power off the switches —
8 Connect the cables
Use cables to connect 10 G ports of the interface
modules:
z The given XFP ports work with XFP optical
transceivers and fibers
z The given SFP+ ports can work with SFP+ optical
transceivers and fibers for long-haul transmission;
or they can be directly connected through
dedicated SFP+ cables for short-haul transmission
z The given CX4 ports use dedicated CX4 cables for
connection
For details about the SFP+/CX4 cable connection,
refer to
Installing Dedicated CX4/SFP+ Cable.
9 Power on the switches Finish establishing an IRF stack system
Drawing a Plan for the Switch Stack
Before implementing a stack of switches, draw a plan according to actual conditions of the user network
and network devices and take the following points into consideration:
Determine the number of stack members and the bandwidth
You can determine the number of stack members and the bandwidth according to the network scale.
z The S5120-EI series support two to four switches in a stack.
z The S5120-EI series support aggregation of the 10 GE ports. You can assign the two 10 GE ports
of an interface module to an aggregation group to expand the bandwidth for the stack.
10 GE ports of different interface modules cannot join the same aggregation group. Therefore, 1-port
XFP interface modules do not support port aggregation.
Select the proper interface modules and cables
You can select the interface modules and cables according to the distance between devices in the stack.
For long-distance stack connections, use XFP or SFP+ optical modules and fibers to connect the
devices; for short-distance stack connections, use LSPM1CX2P or LSPM2SP2P with CX4 or SFP+
cables to connect the devices. For details, see
Optional Interface Modules.
Configure the stack connection mode
IRF stack supports two stack connection modes: link and ring connections. A ring connection is more
reliable than a link connection because functions and performance of the ring stack system will not be