Huawei Quidway S3700 Series Configuration Manual page 39

Quidway S3700 Series Ethernet Switches
Configuration Guide - Device Management
Combining Two Stack Systems
If two stack systems are combined, a new master switch is elected. The running time of the two
stack systems is compared and is accurate to minutes. The stack system that has a long running
time is of a higher priority. If the running time is the same, the election mode in the setup of the
stack system is used for electing the master switch. In one stack system, the roles, configurations,
and services of the switches keep unchanged. In the other stack system, all the switches restart
and join the combined stack system as slave switches. The master switch reassigns stack IDs to
these slave switches and synchronizes its configurations to these slave switches. In addition,
services in this stack system are interrupted.
l An instance loop will occur when a stack link is disconnected intermittently or a new switch
l An instance loop will occur when a stack is being set up.
Dividing a Stack System
Dividing a stack system refers to the action of removing certain member switches with power
on. As shown in
Figure 3-1 Networking diagram of a stack system
Switch A is disconnected from Switch B; Switch C is disconnected from Switch D; Switch B is
directly connected to the Ethernet. As shown in
Issue 01 (2011-07-15)
CAUTION
is added to the stack.
Figure 3-1, Switch A, Switch B, Switch C, and Switch D form Stack-A.
SwitchA
SwitchC
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Ethernet
SwitchB
Stack-A
SwitchD
Figure
stack link
common link
3-2, Switch A and Switch B form Stack-
3 Stacking
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