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.

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