ZyXEL MES-3728 User Guide - Page 361

Chapter 42 Product Specifications Table 125 Firmware Specifications FEATURE DESCRIPTION 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. VLAN Stacking 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. MAC Address Filter Filter traffic based on the source and/or destination MAC address and VLAN group (ID). DHCP (Dynamic Host Configuration Protocol) Relay Use this feature to have the Switch forward DHCP requests to DHCP servers on your network. 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. Differentiated Services (DiffServ) 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 Two Rate Three Color Marker (trTCM, defined in RFC 2698) is a type of traffic policing that identifies packets by comparing them to two user-defined rates: the Committed Information Rate (CIR) and the Peak Information Rate (PIR). Classifier and Policy 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 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 Bandwidth control means defining a maximum allowable bandwidth for incoming and/or out-going traffic flows on a port. Broadcast Storm Control 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 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. MES-3728 User's Guide 361