Accton Technology CheetahSwitch Workgroup-3627 Installation Manual page 15

Overview
Multicast Switching
Specific multicast traffic can be assigned to its own VLAN to ensure that it does not
interfere with normal network traffic and to guarantee real-time delivery by setting
the required priority level for the designated VLAN. The switch uses IGMP Snooping
and GMRP at Layer 2, and IGMP at Layer 3 to manage multicast group registration.
Traffic Priority
This switch provides Quality of Service (QoS) by prioritizing each packet based on
the required level of service, using two distinct categories with Weighted Fair
Queuing. It uses IEEE 802.1p and 802.1Q tags to prioritize incoming traffic based on
input from the end-station application. These functions can be used to provide
independent priorities for delay-sensitive data and best-effort data.
Layer 3 Routing
The CheetahSwitch provides Layer 3 IP routing. To maintain a high rate of
throughput, the switch forwards all intra-segment traffic, and routes only traffic that
passes outside the segment. By providing wire-speed routing, you can easily link
your network segments or VLANs together without having to deal with the
bottlenecks or configuration hassles normally associated with conventional routers.
Most traffic can be routed based on information maintained within the switch's own
database. If the address is not in the switching database, the switch will use RIP or
RIPv2 protocol to request the address. If the address still cannot be found, the
switch can pass the packet to a default router for handling.
The switch uses DVMRP protocol to determine the routing for multicast packets. If
no hosts have subscribed to the indicated multicast service, the packet will be
dropped.
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