Css Overview; Css Features Supported By The S9300 - Huawei Quidway S9300 Configuration Manual

Quidway S9300 Terabit Routing Switch
Configuration Guide - Device Management

2.1 CSS Overview

A CSS is also called a stack. In a CSS, two switches are connected through dedicated stacking
cables to form a logical switch.
A single switch cannot meet requirements of the increasing access volume of a data center and
network reliability. To meet the forwarding requirement of the data center and improve network
reliability, the CSS technology is used.
After two switches set up a CSS, one switch functions as the master switch, and the other
functions as the backup switch.

2.2 CSS Features Supported by the S9300

This section describes the CSS features supported by the S9300.
Prerequisites for Setting Up a CSS
A CSS can be set up when the following conditions are met:
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Connection of Stacking Cables
Each SRU can be installed with a stacking card and each stacking card provides four interfaces.
When the two S9300s are installed with double SRUs, the eight pairs of interfaces on the stacking
cards are connected through stacking cables, as shown in
interfaces strictly according to
must be connected to a stacking cable.
Issue 03 (2011-12-29)
NOTE
CSS cannot be configured on the Web NMS.
The switches support the CSS feature. (Currently, the S9306 and the S9312 support the
CSS feature.) An S9306 and an S9312 can form a CSS.
The CSS contains only two switches.
Both the switches are configured with stacking cards.
The same type of SRUs (SRUA or SRUB) must be used on each switch.
NOTE
The LE02SRUA VER.A and LE02SRUB VER.A do not support the CSS function.
The two switches are connected through stacking cables.
The two switches run normally.
The CSS function is enabled on the two switches.
The two switches use the same software version. If the master switch detects a different
software version on the backup switch, the software of the backup switch is upgraded or
rolled back to the version of the master switch.
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Figure 2-1 and do not change the connections. Every interface
2 CSS Configuration
Figure 2-1. Connect the stacking
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