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.

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