CSS modes on S series modular switches

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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.

Other related questions:
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.

How to restart the CSS of S series modular switches
After S series modular switches establish a CSS, two devices are virtualized into one logical switch. You can run the reboot command to restart the CSS.

How to split a CSS composed of S series modular switches
Perform the following steps to split the CSS of S series modular switches (two standalone switches are restored): 1. Back up the configuration file. (1) Run the save command to save the setting. (2) Run the copy source-filename destination-filename all command to back up the configuration file to the standby switch. Note: Back up the current configuration file to the storage medium of the standby switch before you split the CSS. You can use the configuration file when you set up a CSS next time. 2. Delete the CSS system MAC address. (1) Run the system-view command to enter the system view. (2) Run the undo set css system-mac command to delete the CSS system MAC address. 3. Disable the CSS function. Run the undo css enable all command to disable the CSS function on two member switches. Two standalone switches are restored after they restart. 4. Restore physical member ports to service ports. (This step is required only in service port clustering.) Note: To restore a physical member port to a service port on a standalone switch, run the undo interface css-port command. To restore a physical member port to a service port in a CSS, run the shutdown interface ** command in the logical CSS port view to shut down the physical member port and then run the undo port interface ** enable command. 5. Power off the switches and remove the cluster cables. You can also remove the cluster cables when the switches are running.

How to change CSS IDs on S series modular switches
Before setting up the CSS, you must run the set css id new-id command to configure different CSS IDs for two devices. new-id can be set to 1 or 2. After the CSS is set up, run the set css id new-id chassis chassis-id command to change the CSS ID. Ensure that the two switches use different CSS IDs. After changing the CSS ID, restart the device to make the configuration take effect.

What is CSS card's bandwidth on S series modular switches
CSS cards such as ES02VSTSA (S7700) and LE0D0VSTSA00 (S9300) provide four 16GE optical interfaces for data transmission and line-speed switching, so a CSS card provides 64 Gbit/s bandwidth (4*16 Gbit/s). CSS cards such as EH1D2VS08000 (S9700&S12700) provide eight 16GE optical interfaces for data transmission and line-speed switching, so a CSS card provides 80 Gbit/s bandwidth (8*10 Gbit/s).

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