ZyXEL VES1724-56B2 User Guide - Page 385

Chapter 47 Product Specifications Table 182 Firmware Specifications FEATURE VLAN VLAN Stacking MAC Address Filter DHCP (Dynamic Host Configuration Protocol) Relay IGMP Snooping Differentiated Services (DiffServ) Two Rate Three Color Marker Classifier and Policy Queuing Bandwidth Control Broadcast Storm Control Port Mirroring Static Route Multicast VLAN Registration (MVR) DESCRIPTION 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. Use VLAN stacking to add an outer VLAN tag to the inner IEEE 802.1Q tagged frames that enter the network. By tagging the tagged frames ("double-tagged" frames), the service provider can manage up to 4,094 VLAN groups with each group containing up to 4,094 customer VLANs. This allows a service provider to provide different service, based on specific VLANs, for many different customers. Filter traffic based on the source and/or destination MAC address and VLAN group (ID). Use this feature to have the Switch forward DHCP requests to DHCP servers on your network. 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. With DiffServ, the switch marks packets so that they receive specific per-hop treatment at DiffServ-compliant network devices along the route based on the application types and traffic flow. Two Rate Three Color Marker (trTCM, defined in RFC 2698) is a type of traffic policing that identifies packets by comparing them to two userdefined rates: the Committed Information Rate (CIR) and the Peak Information Rate (PIR). You can create a policy to define actions to be performed on a traffic flow grouped by a classifier according to specific criteria such as the IP address, port number or protocol type, etc. Queuing is used to help solve performance degradation when there is network congestion. The following scheduling services are supported: Strict Priority Queuing (SPQ) Weighted Round Robin (WRR), and Weighted Fair Queuing (WFQ). This allows the Switch to maintain separate queues for packets from each individual source or flow and prevent a source from monopolizing the bandwidth. Bandwidth control means defining a maximum allowable bandwidth for incoming and/or out-going traffic flows on a port. Broadcast storm control limits the number of broadcast, multicast and destination lookup failure (DLF) packets the Switch receives per second on the ports. 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 routes allow the Switch to communicate with management stations not reachable via the default gateway. 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. VES1724-56 User's Guide 385