ZyXEL Communications Corporation EMG2881-T20A Manual De Usuario
Chapter 9 Applications
EMG2881-T20A User’s Guide
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9.6 UPnP Screen
Use this screen to enable UPnP on your EMG2881-T20A.
Click Configuration > Applications > UPnP to display the screen shown next.
Figure 46 Configuration > Applications > UPnP
The following table describes the fields in this screen.
9.7 Technical Reference
The following section contains additional technical information about the EMG2881-T20A features
described in this chapter.
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.
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).
table describes the traffic types defined in the IEEE 802.1d standard (which incorporates the 802.1p).
Table 37 Configuration > Applications > UPnP
LABEL
DESCRIPTION
UPnP
Select Enable to activate UPnP. Be aware that anyone could use a UPnP application to
open the web configurator's login screen without entering the EMG2881-T20A's IP address
(although you must still enter the password to access the web configurator).
open the web configurator's login screen without entering the EMG2881-T20A's IP address
(although you must still enter the password to access the web configurator).
Apply
Click Apply to save the setting to the EMG2881-T20A.
Cancel
Click Cancel to return to the previously saved settings.
Table 38 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.
Level 4
Typically used for controlled load, latency-sensitive traffic such as SNA (Systems Network
Architecture) transactions.
Architecture) transactions.
Level 3
Typically used for “excellent effort” or better than best effort and would include important business
traffic that can tolerate some delay.
traffic that can tolerate some delay.
Level 2
This is for “spare bandwidth”.