Monitoring interfaces are used together with the NMS and monitored devices.
Monitoring interface is a basic feature of a switch and is not under license control.
Only the following switch models support monitoring interfaces:
S5720I-SI (except S5720I-6X-PWH-SI-AC and S5720I-10X-PWH-SI-AC), S5735-S-I
One S5720I-SI switch can monitor two peer devices.
One S5735-S-I switch can monitor only one device.