Are cables connected or CSS is configured first when S series modular switches establish a CSS

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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

Other related questions:
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.

How to connect CSS cables of S series modular switches
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.

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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