SNMP on VSX

[Buitre]

Hello

i have VSX Checkpoint 15400 with R80.30 take 251.

I can snmpwalk to physical IP getting info, ex. with command

snmpwalk -v 2c -c public x.x.x.x .1.3.6.1.2.1.4.20

But if i try  same command to virtual ip (VSX firewalls configured on same physical device) i get no response.

Is possible to monitor VSX or only physical device ?

In the command working, can i specify virtual device to monitor, ex. vsx hostname ?

thanks

Giuliano