No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
Rate and give feedback:
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).
Introduction to CSS

Introduction to CSS


A Cluster Switch System (CSS) is a logical switch consisting of two clustering-capable switches. A CSS is also called a cluster. Figure 8-3 shows the topology of a CSS.

Figure 8-3  Topology of a CSS
CSS technology development has gone through the following two stages:
  • Traditional CSS

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

  • Cluster Switch System Generation 2 (CSS2)

    It sets up a CSS by connecting CSS cards on switch fabric units (SFUs). In addition to sharing features with traditional CSS, CSS2 supports 1+N backup of MPUs and 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.

CSS2 has the following advantages over traditional CSS:
  • Clustering using CSS cards on SFUs

    Unlike with clustering using service ports, control packets and data packets of a cluster only need to be forwarded by SFUs and do not go through service cards. This mode minimizes the impact of software failures, reduces the risk of card failures, and significantly shortens transmission latency.

    CSS2 allows for simpler cable connections and faster system startup than clustering using CSS cards on MPUs because SFUs and MPUs start up simultaneously.

  • 1+N backup of MPUs

    A dual-chassis CSS can work normally as long as one MPU in either chassis is running normally. Therefore, CSS2 is more reliable than clustering using service ports, in which every chassis must have at least one MPU working normally, and is more flexible than clustering using CSS cards on MPUs, in which there are strict hardware restrictions. 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 network reliability and scalability, 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 a single device. You can log in to the CSS from either member switch to configure and manage the entire CSS.

Updated: 2019-08-21

Document ID: EDOC1000142080

Views: 108119

Downloads: 141

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Previous Next