ZyXEL Communications P-870HW-51A V2, Руководство пользователя

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Chapter 11 Quality of Service (QoS)
P-870HW-51a v2 User’s Guide
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11.6 Technical Reference
The following section contains additional technical information about the ZyXEL Device
features described in this chapter.
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.
IEEE 802.1p specifies the user priority field and defines up to eight separate traffic types. The
following table describes the traffic types defined in the IEEE 802.1d standard (which
incorporates the 802.1p).
Port If you select a protocol type, enter the port number(s) of the destination. 0
means any destination port number.
MAC Address Enter the destination MAC address of the packet.
MAC Mask Type the mask for the specified MAC address to determine which bits a packet’s
MAC address should match.
Enter “f” for each bit of the specified destination MAC address that the traffic’s
MAC address should match. Enter “0“ for the bit(s) of the matched traffic’s MAC
address, which can be of any hexadecimal character(s). For example, if you set
the MAC address to 00:13:49:00:00:00 and the mask to ff:ff:ff:00:00:00, a packet
with a MAC address of 00:13:49:12:34:56 matches this criteria.
Others
Protocol Select the protocol (service type) from TCP , UDP , ICMP or IGMP .
Differentiated
Services Code
Point (DSCP) Select a DSCP value from the drop-down list box.
default represents the default DSCP value 000000 or 0x00.
802.1p Priority 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.
DHCP Select Vendor Class ID (DHCP Option 60) or User Class ID (DHCP Option
77) for the matched traffic.
Back Click Back to return to the previous screen without saving.
Apply Click Apply to save your changes back to the ZyXEL Device.
Cancel Click Cancel to begin configuring this screen afresh.
Table 41 QoS Class Configuration (continued)
LABEL DESCRIPTION
Table 42 IEEE 802.1p Priority Level and Traffic Type
PRIORITY
LEVEL
TRAFFIC TYPE
Level 7 Typically used for network control traffic such as router configuration messages.
Level 6 Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations in
delay).
Level 5 Typically used for video that consumes high bandwidth and is sensitive to jitter.