ZyXEL Communications ES-3124 User Manual page 34

ES-3124 Series User's Guide
VLAN
A VLAN (Virtual Local Area Network) allows a physical network to be partitioned into
multiple logical networks. Devices on a logical network belong to one group. A device can
belong to more than one group. With VLAN, a device cannot directly talk to or hear from
devices that are not in the same group(s); the traffic must first go through a router.
Queuing
Queuing is used to help solve performance degradation when there is network congestion.
Three scheduling services are supported: Strict Priority Queuing (SPQ), Weighted Round
Robin (WRR) and Weighted Fair Schedule (WFS). This allows the switch to maintain separate
queues for packets from each individual source or flow and prevent a source from
monopolizing the bandwidth.
Port Mirroring
Port mirroring allows you to copy traffic going from one or all ports to another or all ports in
order that you can examine the traffic from the mirror port (the port you copy the traffic to)
without interference.
Static Route
Static routes tell the switch how to forward IP traffic when you configure the TCP/IP
parameters manually.
IGMP Snooping
The switch supports IGMP snooping enabling group multicast traffic to be only forwarded to
ports that are members of that group; thus allowing you to significantly reduce multicast
traffic passing through your switch.
Multicast VLAN Registration (MVR)
Multicast VLAN Registration (MVR) is designed for applications (such as Media-on-Demand
(MoD)) using multicast traffic across a network. MVR allows one single multicast VLAN to
be shared among different subscriber VLANs on the network.
This improves bandwidth utilization by reducing multicast traffic in the subscriber VLANs
and simplifies multicast group management.
STP (Spanning Tree Protocol) / RSTP (Rapid STP)
(R)STP detects and breaks network loops and provides backup links between switches,
bridges or routers. It allows a switch to interact with other (R)STP -compliant switches in your
network to ensure that only one path exists between any two stations on the network.
The switch allows you to create multiple STP configurations and assign ports to a specific tree.
34 Chapter 1 Getting to Know Your Switch