Requirements for service port clustering on S series modular switches

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For service port clustering on S series switches, the supported device model, service card model, cable model, and service card usage restrictions are described on the right page.
If you want to learn more about the requirements for service port clustering:
For S7700&S9700 series switches, visit Example for Setting Up a CSS Using Service Ports-Software and Hardware Requirements on the Service Port Connection Mode�?/a>.
For S9300 series switches, visit
Typical CSS Configuration of Modular Switches-Example for Setting Up a CSS Using Service Ports-Software and Hardware Requirements on the Service Port Connection Mode�?/a>.
S12700 series switches do not support service port clustering.

Other related questions:
CSS cables supported when S series modular switches use service port clustering
For details about supported CSS cables and the maximum of transmission distance when S series modular switches use service port clustering, see the right page. For details about CSS cables on S series fixed switches

Optical modules supported when S series modular switches use service port clustering
For details on optical modules supported when S series modular switches use service port clustering, see “Pluggable Modules for Interfaces�?on the right page.

Whether the cluster on S series modular switches needs a license
For S7700 and S9700 series switches, licenses are not required for CSS card and service port clustering. Licenses are not required for S12700 clustering. For S9300 series switches, licenses are not required for CSS card clustering, but required for service port clustering.

What is the function of the cluster priority on S series modular switches
For S series modular switches, the clustering priority of a member switch determines the role of the member switch in role election. A larger value indicates a higher priority and higher probability that the member switch is elected as the master switch. However, if a switch with a high priority starts slowly, it cannot be the master switch. If you want a switch to be the master switch, start the switch first. Election rules for an S series master switch: 1. The switch that starts and enters the single-chassis CSS state first becomes the master switch. 2. If the two switches complete startup at the same time, the switch with a higher priority becomes the master switch. 3. If the two switches complete startup at the same time and have the same priority, the switch with a smaller MAC address becomes the master switch. 4. If the two switches complete startup at the same time and have the same priority and MAC address, the switch with a smaller CSS ID becomes the master switch.

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