Patton electronic 2160 user manual IP Dscp Priority QoS

Model 2160 Series User Manual 5 • Console and Telnet configuration

VLAN Tag Priority uses the tag field information which has been inserted into an Ethernet frame. If a port has an 802.1Q-compliant device attached (such as this Ethernet Extender), these tagged frames can carry VLAN membership information.

Priority defines the user priority level for different classes of traffic. There are 8 possible priority levels, with 0 being the lowest priority level and 7 being the highest level. Each Priority level can be set queue from 0 to 3.

	Table 26. VLAN Tag Priority Levels
Priority Level	Traffic Type
0 (default)	Best Effort
1	Background
2	Spare
3	Excellent Effort
4	Controlled Load
5	Video, less than 100 milliseconds latency and jitter
6	Voice, less than 10 milliseconds latency and jitter
7	Network Control

For example, you can set the Model 2160 to use Weighted Round-Robin (WRR) queuing (Type 1) that speci- fies a relative weight of each queue. WRR uses a predefined relative weight for each queue that determines the percentage of s time to services for each queue before moving on to the next queue.

Table 27. VLAN Tag Priority QoS Options

VLAN Tag Index 0 1 2 3 4 5 6 7

Queue Index

IP DSCP Priority QoS

Differentiated Services (DiffServ) is a class of service (CoS) model that enhances best-effort Internet services by differentiating traffic by users, service requirements and other criteria. Packets are specifically marked, allowing network nodes to provide different levels of service, as appropriate for video playback, voice calls or other delay-sensitive applications, via priority queuing or bandwidth allocation.

The DSCP value used to identify 64 levels (26=64) of service determines the forwarding behavior that each packet gets across the DiffServ network. Based on the marking rule different kinds of traffic can be marked for different priorities of forwarding. Resources can then be allocated according to the DSCP values and the con- figured policies.

Set up queue index (0, 1, 2 or 3) on each DSCP:

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Command: setup qos ipDscpPri <0~63> <0~3>

Message: Please input the following information.

IP DSCP index <0~63>: 0

Queue index (ENTER for default) <0>:

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Setup Command Menu 85