Indicates the VLAN forwarding policy.
Options:
1. vlanMac(1) -indicates forwarding based on the VLAN+MAC.
2. vlanConnect(2) -indicates forwarding based on the SVLAN+CVLAN.
3. notConfig(3) -indicates forwarding based on VLAN single switch.
This leaf is optional for creating a VLAN service profile.
The VLAN forwarding policy can also be configured in hwVlanForwarding
of hwVlanMIBTable. If a VLAN service profile is bound to the VLAN,
the configuration in the VLAN service profile takes effect.