How many S series modular switches can be used to establish a CSS

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Two S series modular switches can be used to establish a CSS.

Other related questions:
How many CSS cards can be installed on S series modular switches that constitute a CSS
CSS cards of the S7700/S9700/S9300 are installed on the MPU. Two devices must be equipped with the active and standby MPUs to meet requirements of CSS card connections. In addition, two CSS cards are installed on each device; For the S12700, a CSS card is installed on the SFU. The number of CSS cards must be the same as that of SFUs. One S12708/S12712 supports a maximum of four cards, and the S12704 supports one or two cards. Using two or more cards is recommended.

Requirements for the MPU after S series modular switches establish a CSS
The requirements are as follows: CSS card clustering: (1) For the S7700/S9700/S9300, two switches in the CSS must be configured with active and standby MPUs. That is, one switch is equipped with two MPUs. The S7700 and S9300 support the SRUA and SRUB that can have the VSTSA card installed. The MPUs on one switch must have the same model. The local and remote devices can use different models of MPUs, but the same model of MPUs is recommended. The S9700 supports only the SRUC that has the VS08000 card installed. (2) Each S12700 must be configured with one MPU. You are advised to install at least two MPUs on each S12700 (an S12708 or S12712 can be configured with a maximum of four MPUs and an S12704 can be configured with a maximum of two MPUs). Service port clustering: (1) For the S7700/S9700/S9300, there is no requirement for configuring two MPUs on one switch. The MPUs on one switch must have the same model. In addition, the local and remote devices can use different models of MPUs. If the SRUH is used, the local and remote chassis must use SRUHs. (2) The S12700 does not support service port clustering.

Whether the CSS ID of a port can be canceled after S series modular switches establish a CSS
After S series modular switches establish a CSS, interfaces are numbered in the format of CSS ID/slot ID/subcard ID/port. The CSS ID cannot be deleted or cancelled. To delete the CSS ID, you must disable the CSS function.

Login mode after the CSS of S series modular switches is established
After S series modular switches establish a CSS: In V2R3 and earlier versions, log in to the CSS through the console port on the active MPU. In later versions of V2R3, log in to the CSS through the console port of any MPU. When there are reachable routes, you can remotely log in to the CSS through the management interface on any MPU or a Layer 3 interface using Telnet, STelnet, web, and SNMP.

Management address after S series modular switches establish a CSS
After S series modular switches establish a CSS, the management address in the configuration file of the master switch takes effect.

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