Huawei Quidway S3700 Series Configuration Manual page 36

Quidway S3700 Series Ethernet Switches
Configuration Guide - Device Management
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Creation of a Stack System
If all the member switches in a stack meet the preceding prerequisites, the stack system is
automatically created when a member switch in the stack is powered on.
The master switch is elected as follows:
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The standby switch is elected as follows:
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Before the stacking system is created, each switch is an independent entity. That is, each switch
has its own IP address and functions individually. As a result, a user needs to manage each switch
individually. After the stacking system is created, all the member switches are presented as one
unified logical entity. In this manner, a user manages and maintains all the member switches in
a stack through one IP address. The stacking protocol elects the master switch, standby switch,
and slave switch in a stack. Then, data can be backed up and the active/standby switchover can
be implemented.
The switches are connected through stack cables in a ring or link topology. A master switch is
elected among all the member switches through the stacking protocol. The master switch
manages the stacking system by assigning stack IDs to member switches, collecting information
about the topology of the stack, and informing all the stack members of the topology information.
A standby switch is specified by the master switch. The standby switch becomes the master
switch to manage the stack system if the original master switch is faulty.
After the master, standby, and slave switches are specified, the master switch collects the packets
that are sent from all the slave switches to report the topology information, and then generates
stack entries accordingly and deliver the entries to all the member switches in the stack.
Issue 01 (2011-07-15)
NOTE
l When the products of the same series are stacked, the switch that is closest to the physical interface
of the new member switch added to the stack system synchronizes the system version of the new
member switch.
l If no switch in the stack system is of the same series as the new member switch or the system
version of the new member switch cannot be synchronized to the master switch version, the new
member cannot join the stack system.
Use the devices of the same type (for example, EI devices or SI devices) as the member
switches of a stack system. The EI devices and SI devices cannot be used in the same stack
system.
Connect all devices by using leased stack cables.
Ensure that all the stack devices can be started normally.
Ensure that the stacking function is enabled on all the stack devices.
The device that is started first becomes the master switch.
If all the devices are started at the same time, the one of the highest priority becomes the
master switch.
If all the devices are started at the same time and are of the same priority, the one with the
smallest MAC address becomes the master switch.
If all the switches excluding the master switch start at the same time, the master switch
preferentially selects the switch connected to stack interface 2 on the master switch as the
standby switch.
If all the other switches excluding the master switch start at the same time and no switch
is connected to stack interface 2 on the master switch, the master switch selects the switch
connected to stack interface 1 on the master switch as the standby switch.
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