I have attached a power point for your review. We are seeing excessive packets jumping VLANS so-to-speak. On the drawing you will see XYZ receiver which sends out boatloads of UDP packets (i.e., broadcasts constantly). We are OK if they remain confined to VLAN 30. However, they are jumping across a non-trunked link to VLAN 40. The excessive broadcasts are affecting our ABC system's performance. The switches involved are a Cisco Catalyst 4948 and a Cisco Catalyst 3500. Any idea what command I can enter or remove to eliminate the unwanted traffic?