H3C S5120-EI Series Operation Manual page 1143

Figure 1-3 Stack port correspondence
Based on the type and number of the interface module inserted on Switch A, you can adopt one of the
following typical correspondences to establish a stack connection.
The dual-port 10 GE CX4 interface module is used in the following examples to introduce
correspondence between the logical stack port and the physical stack port(s).
When the dual-port 10 GE SFP interface module is used, the correspondence between the logical
stack port and the physical stack port(s) is similar.
1) Stack port correspondence for one interface module
Figure 1-4 Stack port correspondence for one interface module
When a dual-port interface module is installed, you need to bind IRF-port 1 to physical stack port 1, and
IRF-port 2 to physical stack port 2 (as shown in
stack port bound to IRF-port 1 must be smaller than that of the physical stack port bound to IRF-port 2.
Therefore, you cannot bind IRF-port 1 to physical stack port 2, and IRF-port 2 to physical port 1.
If only one single-port interface module is installed, the device can be used only as Switch B or
Switch C in Figure
In this situation, because only one logical stack port is needed on Switch B or Switch C, IRF-port 2
or IRF-port 1 can be bound to any physical port on the device.
2) Stack port correspondence for two interface modules
Correspondence in non-aggregate mode
1-3, that is, the device should be at either end of a bus connection.
1-4
Figure 1-4), because the serial number of the physical