Thanks for the reply. We're running version 12.3R9.4.
> show version fpc0: -------------------------------------------------------------------------- Hostname: ASW01 Model: ex2200-48p-4g JUNOS Base OS boot [12.3R9.4] JUNOS Base OS Software Suite [12.3R9.4] JUNOS Kernel Software Suite [12.3R9.4] JUNOS Crypto Software Suite [12.3R9.4] JUNOS Online Documentation [12.3R9.4] JUNOS Enterprise Software Suite [12.3R9.4] JUNOS Packet Forwarding Engine Enterprise Software Suite [12.3R9.4] JUNOS Routing Software Suite [12.3R9.4] JUNOS Web Management [12.3R9.4] JUNOS FIPS mode utilities [12.3R9.4]
One thing I thought might be causing issues was spanning tree protocol, so I disabled it globally.
> show spanning-tree statistics vlan vlan-id 316 Spanning-tree is not enabled at global level for vlan 316.
Although this doesn't seem to have done much. The switch is still showing no DHCP packets under the show helper stats command.
The RVI numbering is quite confusing - no thanks to j-web for that!