Huawei Quidway S9300 Configuration Manual page 26

Quidway S9300 Terabit Routing Switch
Configuration Guide - Device Management
Figure 2-1 Connection of stacking cables
How a CSS Is Set up
A CSS is set up automatically after two switches are connected through stacking cables and
enabled with the CSS function. After competition, one switch becomes the master switch, and
the other becomes the backup switch.
The master switch is elected as follows:
l
l
l
All the boards in the CSS are registered with the active SRU of the CSS. After the registration,
the configuration data is restored through the configuration file on the active SRU of the CSS.
The configuration restoration process of the CSS is the same as that of a single switch.
Before the CSS is set up, each switch is an independent entity and has its own IP address. You
need to manage the switches separately. After the CSS is set up, the switches in the CSS form
a logical entity, and you can use a single IP address to manage and maintain the switches
uniformly. The IP address and MAC address of the CSS is the IP address and MAC address of
the master switch when the CSS is set up.
Active/Standby Switchover
If SwitchA is the master switch, and SwitchB is the backup switch, then the active SRU of
SwitchA becomes the active SRU of the CSS, and the active SRU of SwitchB becomes the
Issue 03 (2011-12-29)
1 2 3 4 SRU
1 2 3 4 SRU
SwitchA
The switch that starts and enters the stacking state (with the CSS function enabled) first is
selected as the master switch.
If the two switches start at the same time, the switch of the higher priority becomes the
master switch.
If the two switches start at the same time and have the same stacking priority, the one with
a smaller MAC address becomes the master switch.
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2 CSS Configuration
Stacking Card
1 2 3 4 SRU
1 2 3 4 SRU
SwitchB
Stacking cable
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