Chapter 4 - Operation and Administration

Each one of these classifiers can be activated/deactivated. If more than one classifier is activated, the priority of each packet will be determined by the highest priority given to it by the active classifiers.

The Traffic Prioritization menu enables activating/deactivating each of these classifiers, and configuring the applicable parameters for each classifier.

The Low Priority Traffic Minimum Percent parameter can be used to prevent starvation of low priority traffic by ensuring that a certain number of low priority packets is transmitted even at the expense of high priority traffic.

In addition, the Wireless Link Prioritization, which is a licensable feature, enables to configure parameters that affect the prioritization of traffic in the wireless link for packets with high/low priority from different units.

4.2.6.6.3.1 VLAN Priority Threshold

The VLAN Priority Threshold is applicable for Trunk and Hybrid Links only. It enables defining the value of the VLAN Priority Threshold. If the VLAN Priority field in a tagged frame is higher than the value of the VLAN Priority Threshold parameter, the packet will be routed to the High queue. If the VLAN Priority field is lower than or equal to this value, the packet will be transferred to the Low queue (unless it is assigned a High priority by another classifier).

Valid values range from 0 to 7.

The default value is 7, which means that all packets get a low priority (equivalent to disabling the VLAN-based classifier).

4.2.6.6.3.2 ToS Prioritization

The ToS Prioritization parameters enable defining prioritization in accordance with either the 3 IP Precedence bits in the IP header in accordance with RFC 791, or the 6 DSCP (Differentiated Services Code Point) bits in accordance with RFC

2474. The ToS Prioritization menu includes the following parameters:

4.2.6.6.3.2.1ToS Prioritization Option

The ToS Prioritization Option defines whether ToS-based prioritization is enabled or disabled. The following options are available:

„Disable

„Enable IP Precedence (RFC791) Prioritization

„Enable DSCP (RFC2474) Prioritization

The default is Disable.

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Alvarion SW VERSION 5.1 system manual Vlan Priority Threshold, 6.6.3.2.1ToS Prioritization Option