H3C S5120-EI Series Operation Manual page 1158

[Switch2] irf member 1 irf-port 2 port 3
# Configure Switch 3.
<Switch3> system-view
[Switch3] irf member 1 renumber 3
Warning: Renumbering the switch number may result in configuration change or loss.
Continue?[Y/N]:y
[Switch3] irf member 1 irf-port 2 port 3
2) Power off the three devices. Connect them as shown in
on, and the stack is formed.
Figure 1-9
1-19
with stack cables. Power them