3Com 2848 SFP User Guide - Page 33

Advanced Port Configuration Use the Advanced Port Configuration tab to set the Switch's broadcast storm control and threshold limits. A broadcast storm is an incorrect packet sent out on a network that causes most hosts to respond all at once, typically with wrong answers that start the process over again. Broadcast storms use substantial network bandwidth and may cause network time-outs. Advanced settings include: ■ Broadcast Storm Control - Enables and disables broadcast storm control ■ Packet Rate Threshold - Sets the broadcast storm threshold (64 to 95232000 bytes per packet) Figure 12 Advanced Port Configuration Screen Configuring VLANs 33 Default Port Settings If you do not configure the Switch's port settings, the ports will use the following default settings: ■ All ports are enabled ■ Autonegotiation is enabled ■ Flow control is enabled ■ Priority is disabled Configuring VLANs A virtual LAN (VLAN) is a collection of network nodes that share the same collision domain, regardless of their physical location or connection point in the network. A VLAN serves as a logical workgroup with no physical barriers, and allows users to share information and resources as though located on the same LAN. You can use the Switch to create VLANs to organize any group of ports into separate broadcast domains. VLANs confine broadcast traffic to the originating group and help eliminate broadcast storms in large networks. This also provides for a more secure and cleaner network environment. Using the Switch, you can create up to 64 VLANs, add specific ports to a chosen VLAN (so that the port can only communicate with other ports on the VLAN), or configure a port make it a member of all VLANs.