What are changes in performance after S series modular switches establish a CSS

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After S series modular switches establish a CSS, the performance of hardware is enhanced. For example, the number of interfaces is the sum of interfaces on two devices. However, the software specifications such as various service entries are still specifications of one device.

Other related questions:
What are configuration changes and limitations after S series modular switches establish a CSS
After S series modular switches establish a CSS, the configuration file of the master switch is used. After the standby switch starts up, it synchronizes its configuration file with the master switch. A CSS ID identifies a member switch. Interfaces are numbered in the format of CSS ID/slot ID/subcard ID/port number, for example, GE2/1/0/1. The value 2 indicates a CSS ID. In terms of supported features and functions, Ethernet clock synchronization is not supported on a single S7700&S9700; Ethernet clock synchronization and PTP are not supported on a single S9300.

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.

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.

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