How to connect CSS cables of S series modular switches

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For details about CSS connection models on S series modular switches, see the right page.
1. In CSS card clustering mode, the following CSS card models are supported: ES02VSTSA (S7700), LE0D0VSTSA00 (S9300), and EH1D2VS08000 (S9700 and S12700).
(1) For ES02VSTSA (S7700) and LE0D0VSTSA00 (S9300), the numbers in Figure 1 are the numbers of labels on both ends of a cable. All ports must be connected in sequence.
(2) The EH1D2VS08000 CSS card has eight SFP plus ports, which are assigned to two groups. Ports 1 to 4 belong to group 1, and ports 5 to 8 belong to group 2. A port in group 1 of a CSS card can be connected to any port in group 1 of the CSS card on the other chassis. The requirements for ports in group 2 are the same.
For the S9700, connect cables between groups according to Figure 2. Ports in a group can be connected in any sequence, but each group must have at least one cable connected. Full-mesh connections are recommended.
For the S12700, connect cables between groups according to Figure 3. The two chassis must be connected with at least one CSS cable. CSS cards have the same number of cluster cables connected. In addition, interfaces on CSS cards are connected based on the interface number. If the ET1D2SFUD000 card is installed, it is recommended that CSS cards have the even number of cluster cables connected.
The S12700 CSS supports only one MPU and one SFU. You are advised to install at least two SFUs and two CSS cards in each chassis (S12704 can be configured with a maximum of two SFUs and two CSS cards).
2. Figure 4 shows the service port connection mode. The S7700, S9700, and S9300 support service port clustering. Service ports are connected in two ways.
(1) 1+0 networking: Configure one logical CSS port for each member switch and connect physical member ports on the one service card to set up the CSS.
(2) 1+1 networking: Configure two logical CSS ports and connect physical member ports on two cards through the CSS links on the cards for link backup. See Figure 4.
When connecting cluster cables, pay attention to the following points:
(1) The two devices can be connected by one cluster cable. However, it is unstable. It is recommended that the devices be connected by at least two cluster cables. You are advised to use 1+1 networking.
(2) Physical member ports in a logical CSS port on one switch must connect to physical member ports in a logical CSS port on the other switch.
(3) In 1+1 networking, two service cards must have the same number of cluster links.

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

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.

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