User manual ZYXEL GS-1524

[. . . ] GS-1524 / GS-1548 Web Managed GbE Switch User's Guide Version 1. 12 8/2007 Edition 1 www. zyxel. com About This User's Guide About This User's Guide Intended Audience This manual is intended for people who want to configure the Switch using the web configurator. You should have at least a basic knowledge of TCP/IP networking concepts and topology. Related Documentation · Quick Start Guide The Quick Start Guide is designed to help you get up and running right away. It contains information on setting up your hardware connections. [. . . ] Priority This value indicates packet priority and is retrieved from the priority tag field of incoming packets. The values range from 0 (lowest priority) to 7 (highest priority). Click the options below the priority values to send packets of a specific priority to a particular queue. You can also set this priority based on criteria you configure in the Advanced QoS screens. See the sections later in this chapter for more information. This field indicates which Queue (0 to 3) you are configuring. Queue 0 has the lowest priority and Queue 3 the highest priority. Queue 0 . . . Queue 3 GS-1524/GS-1548 User's Guide 71 Chapter 11 QoS Table 17 QoS Setting (continued) LABEL Weight DESCRIPTION You can only configure the queue weights when Weighted Round Robin is selected. Bandwidth is divided across the different traffic queues according to their weights. Note: If you want to use Strict Priority but want to change the weights for the queues, configure them with Weighted Round Robin selected first and then change the scheduling method to Strict Priority. Apply Click Apply to save your changes. 11. 3. 1 Change Number of Queues Use the Change Number of Queues screen to edit the number of queues on the Switch. Click Change in the QoS Setting screen to view the following screen. Figure 39 Change Number of Queues Select the number of queues from the Number of Queues drop down list box and click Apply to save your settings to the Switch. 11. 4 Advanced QoS Settings The following sections describe additional methods for setting priority for incoming packets on the ports. The Switch allows you to choose one of the following methods: Advanced QoS methods only affect the internal priority queue mapping for the Switch. The Switch does not modify the IEEE 802. 1p value for the egress frames. 11. 4. 1 Port Based QoS You can configure the Switch to assign a IEEE 802. 1p priority to packets based on the ingress (incoming) port of the packet. Select Port Based QoS in the QoS Enhancement Setting screen to view the following screen. 72 GS-1524/GS-1548 User's Guide Chapter 11 QoS Figure 40 Port Based QoS The following table describes the labels in this screen. Table 18 Port Based QoS LABEL Mode Change Priority DESCRIPTION Select Port Based QoS to specify priority rules based on the port of incoming packets. Configure the following: · Port - Select the number of the port for which you want to assign IEEE 802. 1p priority to incoming frames. · Priority - Select the IEEE 802. 1p priority you want to assign to the packets coming into the Switch on the port specified in the Port field. Click Change to view your changed settings. Note: The changes are not applied until you click Apply Change Settings. Port, Priority Apply Change Settings This is a summary table of your port to IEEE 802. 1p priority mappings. The Port column indicates the port number of the incoming packets and the Priority column indicates what IEEE 802. 1p priority gets assigned to those packets. Click this when you have reviewed the changes you want to make and you want to save them to the Switch's memory. GS-1524/GS-1548 User's Guide 73 Chapter 11 QoS 11. 4. 2 DSCP Based QoS The Switch allows you to create a mapping table between Differentiated Services Code Points (DSCPs) tags and IEEE 802. 1p priority tags. 11. 4. 3 Differentiated Services Code Point (DSCP) Overview Differentiated Services (DiffServ) is a class of service (CoS) model that 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. Packets are marked with DiffServ Code Points (DSCPs) indicating the level of service desired. This allows the intermediary DiffServcompliant network devices to handle the packets differently depending on the code points without the need to negotiate paths or remember state information for every flow. In addition, applications do not have to request a particular service or give advanced notice of where the traffic is going. DiffServ defines a new DS (Differentiated Services) field to replace the Type of Service (ToS) field in the IP header. [. . . ] Viewing Certifications 1 Go to http://www. zyxel. com. 2 Select your product on the ZyXEL home page to go to that product's page. 3 Select the certification you wish to view from this page. ZyXEL Limited Warranty ZyXEL warrants to the original end user (purchaser) that this product is free from any defects in materials or workmanship for a period of up to two years from the date of purchase. During the warranty period, and upon proof of purchase, should the product have indications of failure due to faulty workmanship and/or materials, ZyXEL will, at its discretion, repair or replace the defective products or components without charge for either parts or labor, and to whatever extent it shall deem necessary to restore the product or components to proper operating 158 GS-1524/GS-1548 User's Guide Appendix B Legal Information condition. [. . . ]