H3C S5120-EI Series Operation Manual page 1144

Figure 1-5 Correspondence in non-aggregate mode for two interface modules
When two dual-port interface modules are installed, if the correspondence is not in the aggregate mode,
you can bind a logical stack port to any physical stack port
However, you must ensure that the serial number of the physical stack port bound to IRF-port 1 is
smaller than that of the physical stack port bound to IRF-port 2, namely, the physical stack port bound to
IRF-port 2 should be located on the right side of the physical stack port bound to IRF-port 1. The two
physical stack ports bound to the logical stack ports can be located either on one interface module or on
different interface modules.
If two single-port interface modules are installed, you need to bind IRF-port 1 to physical stack port
1, and IRF-port 2 to physical stack port 3.
If one dual-port interface module and one single-port interface module are installed, the
correspondence is the same with that when you install two dual-port interface modules. In this
situation, IRF-port 2 or IRF-port 1 can be bound to any physical port on the device, because only
one logical stack port is needed on Switch B or Switch C.
Correspondence in aggregate mode
Figure 1-6 Correspondence in aggregate mode for two interface modules
Because the two physical stack ports bound to an aggregate stack port must be located on the same
interface module, two logical stack ports (that is, two aggregate stack ports) can only be bound to the
two physical stack ports on each of the two interface modules respectively (as shown in
(Figure 1-5
1-5
only shows one possibility).
Figure 1-6). In