Which CSS cards are supported when S series modular switches establish a CSS

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The S9706/S9712 and S12704/S12708/S12712 support EH1D2VS08000; the S7706/S7712 supports ES02VSTSA; the S9306/S9312 supports LE0D0VSTSA00.
Different types of CSS cards cannot be used together.

Other related questions:
Are cables connected or CSS is configured first when S series modular switches establish a CSS
When S series modular switches establish a CSS, you are advised to connect cables before CSS configuration. For details on CSS setup and configuration of S7700&S9700

CSS modes on S series modular switches
S series modular switches support CSS card connection and service port connection. CSS card clustering: Member switches are connected using dedicated CSS cards and cluster cables. Service port clustering: Member switches are connected using common service ports, without a need for dedicated CSS cards. The service port connection mode occupies service ports and requires at least 10GE ports on LPUs. The S7706/S7712, S9706/S9712, and S9306/S9312 support CSS card connection and service port connection; but the S12700 supports only CSS card connection. Purchase CSS cards when the CSS card connection mode is used. When the service port connection mode is used, the S9306/S9312 requires the license whereas other models do not require the license. Typical CSS Configuration in Typical Configuration Examples describes the CSS support, CSS mode, hardware requirements, typical networking, and configuration procedure. For details on software and hardware requirements of S7700&S9700 CSS, see "Software and Hardware Requirements for the CSS Card Connection Mode" and "Software and Hardware Requirements on the Service Port Connection Mode" in S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples-Typical CSS Configuration of Modular Switches. For details about on software and hardware requirements of the S12700 CSS, see "Software and Hardware Requirements for the CSS Card Connection Mode" and "Software and Hardware Requirements on the Service Port Connection Mode" in S12700 Typical Configuration Examples- Typical CSS Configuration of Modular Switches. For details about on software and hardware requirements of the S9300 CSS, see "Software and Hardware Requirements for the CSS Card Connection Mode" and "Software and Hardware Requirements on the Service Port Connection Mode" in Sx300 Series Switches Typical Configuration Examples- Typical CSS Configuration of Modular Switches.

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.

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