TP-Link T2500-28TCTL-SL5428E T2500-28TCUN V1 User Guide - Page 187
Schedule Mode, 1P Priority Config, Priority and CoS-mapping Config, Schedule Mode, Operation
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The following entries are displayed on this screen: 802.1P Priority Config 802.1P Priority: Enable/Disable 802.1P Priority. Priority and CoS-mapping Config Tag-id/Cos-id: Indicates the precedence level defined by IEEE802.1P and the CoS ID. Queue TC-id: Indicates the priority level of egress queue the packets with tag and CoS-id are mapped to. The priority levels of egress queue are labeled as TC0, TC1, TC2 and TC3. By default, the mapping relation between tag/cos and the egress queue is: 0-TC1, 1-TC0, 2-TC0, 3-TC1, 4-TC2, 5-TC2, 6-TC3, 7-TC3. Note: To complete QoS function configuration, you have to go to the Schedule Mode page to select a schedule mode after the configuration is finished on this page. Configuration Procedure: Step Operation Description 1 Configure the mapping Required. On QoS→DiffServ→802.1P/CoS mapping relation between the 802.1P page, configure the mapping relation between the priority Tag/CoS and the TC 802.1P priority Tag/CoS and the TC. 2 Select a schedule mode Required. On QoS→DiffServ→Schedule Mode page,, select a schedule mode. 11.1.4 Schedule Mode On this page you can select a schedule mode for the switch. When the network is congested, the problem that many packets compete for resources must be solved, usually in the way of queue scheduling. The switch will control the forwarding sequence of the packets according to the priority queues and scheduling algorithms you set. On this switch, the priority levels are labeled as TC0, TC1...TC3. Choose the menu QoS→DiffServ→Schedule Mode to load the following page. Figure 11-9 Schedule Mode The following entries are displayed on this screen: Schedule Mode Config SP-Mode: Strict-Priority Mode. In this mode, the queue with higher priority will occupy the whole bandwidth. Packets in the queue with lower priority are sent only when the queue with higher priority is empty. 177