ZyXEL XGS4700-48F User Guide - Page 457
Firmware Specifications continued
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Chapter 55 Product Specifications Table 170 Firmware Specifications (continued) FEATURE Differentiated Services (DiffServ) Classifier and Policy Queuing Port Mirroring Static Route Multicast VLAN Registration (MVR) DESCRIPTION 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. 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. Three 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. 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 tell the Switch how to forward IP traffic when you configure the TCP/IP parameters manually. 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. IP Multicast RIP OSPF DVMRP VRRP This improves bandwidth utilization by reducing multicast traffic in the subscriber VLANs and simplifies multicast group management. With IP multicast, the Switch delivers IP packets to a group of hosts on the network - not everybody. In addition, the Switch can send packets to Ethernet devices that are not VLAN-aware by untagging (removing the VLAN tags) IP multicast packets. RIP (Routing Information Protocol) allows a routing device to exchange routing information with other routers. OSPF (Open Shortest Path First) is a link-state protocol designed to distribute routing information within an autonomous system (AS). An autonomous system is a collection of networks using a common routing protocol to exchange routing information. OSPF is best suited for large networks. DVMRP (Distance Vector Multicast Routing Protocol) is a protocol used for routing multicast data within an autonomous system (AS). DVMRP provides multicast forwarding capability to a layer 3 switch that runs both the IPv4 protocol (with IP Multicast support) and the IGMP protocol. Virtual Router Redundancy Protocol (VRRP), defined in RFC 2338, allows you to create redundant backup gateways to ensure that the default gateway of a host is always available. XGS4700-48F User's Guide 457