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Enabling VLAN Pruning for Broadcast, Multicast, and Unknown Unicast Traffic in an EX Series Virtual Chassis (CLI Procedure)
You can enable VLAN pruning for VLANs assigned to interfaces in an EX Series Virtual Chassis. When you enable VLAN pruning for a VLAN in a Virtual Chassis, all broadcast, multicast, and unknown unicast traffic entering that VLAN uses the shortest possible path through the Virtual Chassis to the egress VLAN interface. Enabling VLAN pruning allows you to conserve bandwidth within the Virtual Chassis, since all broadcast, multicast, and unknown unicast traffic in a VLAN is broadcast to all Virtual Chassis member switches when VLAN pruning is disabled.
 | Best Practice: We recommend enabling VLAN pruning when configuring a VLAN on an EX Series Virtual Chassis. |
To enable VLAN pruning when configuring a VLAN:
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user@switch# set vlans vlan-name vlan-prune
