snmpwalk for Private Vlan counters on Cisco 3750

I have a script that does an snmpwalk like this

snmpwalk -v 2c -c public ifHCInOCtet

and I get

IF-MIB::ifHCInOctets.1 = Counter64: 54695753 (this is vlan1 ) IF-MIB::ifHCInOctets.50 = Counter64: 29750515 (this is vlan50 ) IF-MIB::ifHCInOctets.99 = Counter64: 1283338600 (this is vlan99 ) IF-MIB::ifHCInOctets.100 = Counter64: 22958261 (this is vlan100 ) IF-MIB::ifHCInOctets.5001 = Counter64: 34873606561 (this is po1 ) IF-MIB::ifHCInOctets.10001 = Counter64: 13014065157228 (this is f1/0/1 ) ......

So the vlans above are also interfaces

! interface Vlan50 description vlan50 MyVlan no ip address !

etc ......

There are also other vlans that I use for private-vlans that are not interfaces.

! vlan 203 name vlan-203-MyPrivateVlan private-vlan community !

These private vlans have a bunch of ports in them. So with "snmpwalk -v 2c -c public ifHCInOCtet" I can get traffic for each interface, I actually want to get traffic for each private-vlan. That amounts to the sum of the traffic of all the ports in a private vlan.

Is there any way to get this with snmpwalk? Or any snmpwalk query that will give any info about private vlans?

Thanks