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S12700 V200R011C10 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview of CSS

Overview of CSS


A Cluster Switch System (CSS), also called a cluster, is a logical switch consisting of two clustering-capable switches. Figure 9-3 shows the topology of a CSS.

Figure 9-3  Schematic diagram of a CSS
CSS technology development has experienced two stages.
  • Traditional CSS

    It consists of two CSS connection modes, namely, clustering through CSS cards on MPUs and clustering through service ports.

  • Cluster Switch System Generation 2 (CSS2)

    This technology sets up a CSS by connecting CSS cards on switch fabric units (SFUs). In addition to the existing CSS features, CSS2 supports 1+N backup of MPUs. CSS2 is supported by the S12700.

    • In versions earlier than V200R010C00, SFUs of all models must have dedicated CSS cards installed. Since V200R010C00, the new model SFUB has integrated a CSS card without having to install a CSS card.

    • The S12710 is a new model in V200R010C00, uses MFUBs and SFUBs, and supports clustering through CSS cards on MFUBs and SFUBs, both of which have integrated CSS cards.

Compared with traditional CSS, CSS2 has the following advantages:
  • Clustering through CSS cards on SFUs

    Unlike the service port connection mode, this connection mode allows control packets and data packets of a cluster to be forwarded by SFUs only without going through service cards. CSS2 minimizes impact of software failures, reduces risks of service interruption caused by service cards, and also significantly shortens the transmission latency. Compared with the CSS connection mode through CSS cards on MPUs, this mode allows for simpler cable connections and faster system startup because the SFUs and MPUs start up simultaneously.

  • 1+N backup of MPUs in a cluster

    A dual-chassis CSS can work normally as long as one MPU in any chassis is running normally. Compared with the service port connection mode in which each chassis must have at least one MPU working normally, CSS2 is more reliable. Compared with the CSS connection mode through CSS cards on MPUs, in which there are strict hardware restrictions, CSS2 is more flexible. For details, see 1+N Backup of MPUs in a Cluster.

Unless otherwise stated, CSS refers to both traditional CSS and CSS2.


In addition to high forwarding performance, CSS technology provides high reliability and scalability on a network, while simplifying network management.

  • High reliability

    Member switches in a CSS work in redundancy mode. Link redundancy can also be implemented between member switches through inter-chassis link aggregation.

  • High scalability

    Switches can set up a CSS to increase the number of ports, bandwidth, and packet processing capabilities.

  • Simplified configuration and management

    After two switches set up a CSS, they are virtualized into one device. You can log in to the CSS from either member switch to configure and manage the entire CSS.

Updated: 2020-02-04

Document ID: EDOC1000178105

Views: 174403

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