Chapter 17 Quality of Service (QoS)
P-79X Series User’s Guide
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17.4 QoS Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
17.4.1 IEEE 802.1Q Tag
The IEEE 802.1Q standard defines an explicit VLAN tag in the MAC header to identify the VLAN
membership of a frame across bridges. A VLAN tag includes the 12-bit VLAN ID and 3-bit user
priority. The VLAN ID associates a frame with a specific VLAN and provides the information that
devices need to process the frame across the network.
Exclude Select this option to exclude the packets that match the specified criteria from
this classifier.
Others
Service This field simplifies classifier configuration by allowing you to select a
predefined application. When you select a predefined application, you do not
configure the rest of the filter fields.
SIP (Session Initiation Protocol) is a signaling protocol used in Internet
telephony, instant messaging and other VoIP (Voice over IP) applications.
Select the check box and select VoIP(SIP) from the drop-down list box to
configure this classifier for traffic that uses SIP.
File Transfer Protocol (FTP) is an Internet file transfer service that operates on
the Internet and over TCP/IP networks. A system running the FTP server
accepts commands from a system running an FTP client. The service allows
users to send commands to the server for uploading and downloading files.
Select the check box and select FTP from the drop-down list box to configure
this classifier for FTP traffic.
Protocol Select this option and select the protocol (TCP or UDP) or select User
defined and enter the protocol (service type) number. 0 means any protocol
number.
Packet Length Select this option and enter the minimum and maximum packet length (from
28 to 1500) in the fields provided.
DSCP Select this option and specify a DSCP (DiffServ Code Point) number between 0
and 63 in the field provided.
Ethernet Priority Select this option and select a priority level (between 0 and 7) from the drop
down list box.
"0" is the lowest priority level and "7" is the highest.
VLAN ID Select this option and specify a VLAN ID number between 2 and 4094.
Physical Port Select this option and select a LAN port.
Exclude Select this option to exclude the packets that match the specified criteria from
this classifier.
Back Click this to return to the previous screen without saving.
Apply Click this to save your changes.
Cancel Click this to restore your previously saved settings.
Table 69 Advanced > QoS > Class Setup: Edit (continued)
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