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Quidway S5700 Series Ethernet Switches
Configuration Guide - Device Management
Figure 3-2 Networking diagram of a stack system
The action of dividing a stack system varies with different roles of the removed switches.
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IP Address and MAC Address Collision After a Stack System Is Divided
The IP address and MAC address of a stack system is configured globally. That is, all the switches
in a stack system share the same IP address and MAC address. When a stack system is divided,
configuration collision may occur at Layer 3. For example, a Layer 3 VLANIF interface is
configured with an IP address 192.168.1.1. After the stack system is divided, two stack systems
with the IP address 192.168.1.1 exist on the network. In this case, IP address and MAC address
collision occurs. Therefore, collision detection must be implemented at Layer 2 and Layer 3
after a stack system is divided.
The dividing of a stack system mentioned here refers to the case that the original master and
standby switches belong to different stack systems after the original stack system is divided. In
Issue 01 (2011-07-15)
Ethernet
SwitchA
Stack-B
SwitchC
After a stack system is divided, the original master and standby switches still belong to the
same stack system. In this case, the master switch recalculates the stack topology and
updates the topology information accordingly. After detecting that the stack protocol
packets time out, the removed slave switches are reset by themselves and reelect the master
switch. The newly-elected master switch obtains the configurations of the stack system
from the flash memory and then restores the configurations of other switches.
After a stack system is divided, the original master and standby switches belong to different
stack systems. In this case, the original master switch specifies another switch as the standby
switch in its own stack system. The process of the stack system becoming stable is the same
as that when the standby switch quits the stack system. In the stack system where the original
standby switch currently belongs, the active/standby switchover is implemented, and the
process of the stack system becoming stable is the same as that when the master switch
quits the stack system.
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SwitchB
Stack-C
SwitchD
stack link
common link
3 Stacking
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