3Com 4007R Implementation Guide - Page 166
Multicast filtering with IGMP Layer 2 Switching Modules
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166 CHAPTER 9: BRIDGE-WIDE AND BRIDGE PORT PARAMETERS s Spanning Tree Protocol - You can configure bridge-wide and bridge port settings to enable STP to detect loops and calculate a network topology that reflects a single, loop-free path between any two devices. For conceptual information about STP, see "STP Terms and Concepts" in this chapter. For information on how to manipulate STP settings, see "STP Bridge and Port Parameters" in this chapter. s Multicast and broadcast limits - You can assign per-port thresholds to limit the per-second forwarding rate of incoming broadcast and multicast traffic. See "Broadcast and Multicast Limits" in this chapter. s IP fragmentation (Multilayer Switching Modules only) - When Fiber Distributed Data Interface (FDDI) stations transmit IP packets that are too large for standard Ethernet to handle, IP fragmentation allows a module to reformat large packets into smaller sizes. See "IP Fragmentation" in this chapter for more information. s IPX SNAP translation (Multilayer Switching Modules only) - IPX SNAP Translation allows any 802.3_RAW IPX packets that are forwarded from Ethernet to FDDI to be translated to FDDI_SNAP (instead of FDDI_RAW), and vice versa. See "IPX SNAP Translation" in this chapter for more information. s GARP VLAN Registration Protocol (Multilayer Switching Modules only) - GVRP simplifies the management of IEEE 802.1Q VLAN configurations in large networks by making aspects of VLAN configuration dynamic. See "GARP VLAN Registration Protocol (GVRP)" in this chapter, as well as the VLAN chapter in this guide. The following features under the bridge menu are covered in other chapters in this guide: s Class of Service (Layer 2 Switching Modules only) - A module can process frames through two priority queues. You assign each of the eight priority levels specified in the IEEE 802.1p standard to one of the two queues. For more information, see the Class of Service chapter in this guide. s Multicast filtering with IGMP (Layer 2 Switching Modules only) - By understanding the Internet Group Management Protocol (IGMP), a module can direct IP multicast packets only to the ports that require them, instead of flooding to all ports. This process conserves bandwidth at the edge of the network. For more information, see the Multicast Filtering with IGMP chapter in this guide.
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