How many CSS cards can be installed on S series modular switches that constitute a CSS

4

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.

Other related questions:
How many S series modular switches can be used to establish a CSS
Two S series modular switches can be used to establish a CSS.

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

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).

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.

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