User Manual

Menus and Parameters
Operation and Administration
191
4.2.6.6.2.10 Show MIR/CIR Parameters
Displays the current values of the MIR and CIR parameters.
4.2.6.6.3 Traffic Prioritiza t ion
Each packet that is received from the Ethernet port is placed in either the High or
Low queue, according to the Traffic Prioritization parameters. When the MIR/CIR
mechanism decides that a packet must be sent, the High priority queue will be
checked first. If the High priority queue is not empty, the first element in the
queue is forwarded to the MIR/CIR mechanism. Packets from the Low priority
queue will be forwarded only if the High queue is empty.
The prioritization of the packets is done using different classifiers:
 VLAN Priority
 ToS Priority: IP Precedence or DSCP
 UDP and/or TCP ports
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).