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Root Switch
Root Switch
Overview
Switch Priority
Root Switch
The following topics are contained in this section:
"Root Switch Overview"
"Switch Priority"
"Root Switch"
"Non-root Switch"
"Examples of Selecting a Root Switch" on page 112
In a LAN topology with multiple GS920 Series switches, one of the
switches is elected to be the root switch for the Loop Prevention feature.
Initially, all of the GS920 Series switches are root switches. They
broadcast Loop Prevention frames to each other and then compare their
relative switch priorities. The switch with the highest switch priority is
selected to be the root switch. If multiple switches have the same highest
switch priority, the switch with the smallest MAC address becomes the root
switch.
Table 26 shows the switch priorities specified for each GS920 Series
model.
Model
AT-GS920/8PS
AT-GS920/8
AT-GS920/16
AT-GS920/24
Note
The AT-GS920/8PS and AT-GS920/8 switches have higher priority
than the AT-GS920/16 and AT-GS920/24 switches.
Once a switch is assigned as the root switch, it is responsible for sending
out Loop Prevention frames. A loop condition exists if the root switch
receives a Loop Prevention frame that it generates itself. Once a loop is
detected, the root switch determines which switch/port to block within the
LAN to prevent the loop.
Table 26. Switch Priority
Switch Priority
Higher
Lower
Chapter : Loop Prevention Feature
111
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