Troubleshooting mechanism after a CSS of S series modular switches splits

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Troubleshooting mechanism:
All member switches in a CSS use the same IP address and MAC address (CSS system MAC address). Therefore, after the CSS splits, two CSSs may use the same IP address and MAC address. To prevent this situation, a mechanism is required to check for IP address and MAC address collision after a split and run multi-active detection. It is highly recommended on a network where the CSS is established.
MAD handles a multi-active situation in the following way: When detecting two CSS systems (two switches) in Active state, MAD allows only the switch with a higher CSS priority to work. (If the two switches have the same CSS priority, their MAC addresses and CSS IDs are compared in turn.) Then the other switch turns to Recovery state, and all its physical ports except the excluded ones are shut down to prevent the switch from forwarding service packets.
For details about the MAD configuration

Other related questions:
Are services affected after a CSS composed of S series modular switches splits
When a CSS splits, the two devices work independently, and inter-chassis services are interrupted. If MAD is configured, the physical interfaces of one device will be shut down, and services on the interfaces are interrupted.

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.

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.

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.

Management address after S series modular switches establish a CSS
After S series modular switches establish a CSS, the management address in the configuration file of the master switch takes effect.

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