HP 6125XLG R2306-HP 6125XLG Blade Switch ACL and QoS Configuration Guide - Page 65
Configuring priority marking, Overview, Color-based priority marking, Packet coloring methods
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Configuring priority marking Overview Priority marking sets the priority fields or flag bits of packets to modify the priority of packets. For example, you can use priority marking to set IP precedence or DSCP for a traffic class of IP packets to control the forwarding of these packets. To configure priority marking, you can associate a traffic class with a traffic behavior configured with the priority marking action to set the priority fields or flag bits of the traffic class of packets. Priority marking can be used together with priority mapping. For more information, see "Configuring priority mapping." Color-based priority marking Packet coloring methods The color of a packet indicates the device's evaluation for the packet transmission priority. The device can color a packet by using either of the following methods: • Traffic policing • Mapping drop precedence Traffic policing Traffic policing is a common traffic control technology. Traffic policing uses the token bucket mechanism to evaluate the incoming or outgoing packets and colors the packets according to the evaluation result. By configuring different traffic control polices for packets in different colors, you can provide differentiated services for different traffic flows and ensure that the network resources are well utilized. The device supports evaluating traffic by using two token buckets (bucket C and bucket E), and it colors a packet according to the number of tokens in the token buckets. The device supports coloring packets by using either of the following traffic policing functions: common CAR and aggregate CAR. For more information about coloring packets by using token buckets and about common CAR and aggregate CAR, see "Configuring traffic policing, GTS, and rate limit" and "Configuring aggregate CAR," respectively. Mapping drop precedence Without traffic policing configured, a switch looks up the 802.1p priority of a packet in the 802.1p-to-drop priority mapping table, allocates the drop precedence value to the packet, and colors the packet according to the drop precedence value. Drop precedence value 0 denotes green packets, 1 denotes yellow packets, and 2 denotes red packets. For more information about priority mapping tables, see "Configuring priority mapping." 59