Hi,
switch-options work because EX4300s use Enhance L2 software [ELS]
http://www.juniper.net/techpubs/en_US/junos13.2/topics/task/configuration/getting-started-els.html
The commands should be as per syntax below:
switch-options { voip { interface (all | [interface-name | access-ports]) { forwarding-class (assured-forwarding | best-effort | expedited-forwarding | network-control); vlan vlan-name; ... } } }
Config:
set switching-options voip interface ge-2/0/15.0 vlan v80-voice set switching-options voip interface ge-2/0/15.0 forwarding-class ezqos-voice-fc
Cheers,
Ashvin