CSS Connection Modes
CSS card connection
Member switches are connected using CSS cards on MPUs or SFUs and cluster cables.
Service port connection
Member switches are connected using service ports on service cards, without requiring CSS cards. The service ports must be configured as physical member ports of logical CSS ports. Figure 3-25 shows physical member ports and logical CSS ports in a CSS.
Physical member port
A physical member port is a service port used to set up a CSS link between CSS member switches. Physical member ports forward service packets or CSS protocol packets between member switches.
Logical CSS port
A logical CSS port is bound to physical member ports for CSS connections. Each CSS member switch supports two logical CSS ports.
NOTE: For details about CSS connection modes, see Establishing a CSS Through CSS Card Connections and Establishing a CSS Through Service Port Connections.
Two member switches in a CSS must be directly connected. That is, there are only the two member switches on the CSS link.
| Item | CSS Card Connection | Service Port Connection | Description |
|---|---|---|---|
| Whether CSS cards are required | Yes If MPUs and SFUs have integrated CSS cards, no CSS cards are required. |
No | The CSS card connection mode ensures high stability and low latency, and facilitates CSS troubleshooting. |
| Whether service ports are occupied | No | Yes | The service port connection mode occupies service ports and requires at least 10GE ports on service cards. |
| Cluster cable connection requirements | CSS cards of switches must be connected according to cable connection rules. | Switches can set up a CSS as long as they are connected by one cluster cable. It is recommended that the switches be connected by at least two cluster cables. | The service port connection mode is more flexible:
|
| Configuration complexity | Simple | Complex | The service port connection mode requires service ports to be configured as physical member ports of logical CSS ports. |
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