3Com 4007, Implementation Manual, Page: 166 / 684

166 C
HAPTER
9: B
RIDGE
-W
IDE AND
B
RIDGE
P
ORT
P
ARAMETERS
■
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.
■
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.
■
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.
■
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.
■
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:
■
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.
■
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.