TP-Link T2600G-18TSTL-SG3216 T2600G-18TSUN V1 Configuration Guide - Page 613
DiffServ Configuration
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Configuring QoS DiffServ Configuration 2 DiffServ Configuration To complete differentiated services configuration, follow these steps: 1) Configure the priority mode to classify packets with different priorities. 2) Configure the schedule mode to control the forwarding sequence of packets. Configuration Guidelines Deploy the priority mode appropriate to your network requirements. Three modes are supported on the switch, 802.1P Priority, DSCP Priority and Port Priority. »» 802.1P Priority 802.1P defines the first three bits in 802.1Q Tag as PRI field. The PRI values are from 0 to 7. 802.1P priority determines the priority of packets based on the PRI value. In this mode, the switch only prioritizes packets with VLAN tag, regardless of the IP header of the packets. »» DSCP Priority DSCP priority determines the priority of packets based on the ToS (Type of Service) field in their IP header. RFC2474 re-defines the ToS field in the IP packet header as DS field. The first six bits (bit 0-bit 5) of the DS field is used to represent DSCP priority. The DSCP values are from 0 to 63. In this mode, the switch only prioritizes IP packets. »» Port Priority In this mode, the switch prioritizes packets according to their ingress ports, regardless of the packet field or type. The switch implements the priority mode in the following sequence when two or more modes are enabled. Implementing sequence: DSCP Priority > 802.1P Priority > Port Priority If all the three priority modes are enabled, the switch will distinguish the received packets and map the packets to different priority queues. IP packets are mapped based on DSCP priority mode, non-IP packets with 802.1Q tag are mapped based on 802.1P priority mode, and the untagged non-IP packets are mapped based on port priority mode. Configuration Guide 583
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