ZyXEL Communications ZyWall USG20-VPN User Manual page 408

802.1P Marking
Use 802.1P to prioritize outgoing traffic from a VLAN interface. The Priority Code is a 3-bit field
within a 802.1Q VLAN tag that's used to prioritize associated outgoing VLAN traffic. "0" is the lowest
priority level and "7" is the highest.
Table 156 Single Tagged 802.1Q Frame Format
DA
Table 157 802.1Q Frame
DA Destination Address
SA Source Address
TPID Tag Protocol IDentifier
VID VLAN ID
The following table is a guide to types of traffic for the priority code.
Table 158 Priority Code and Types of Traffic
PRIORITY
0 (lowest)
1
2
3
4
5
6
7 (highest)
To access this screen, go to the Configuration > Bandwidth Management screen (see
26.2 on page 405), and click either the Add icon or an Edit icon.
Figure 283 Configuration > Bandwidth Management > Edit (For the Default Policy)
Chapter 26 BWM (Bandwidth Management)
SA TPID Priority
TRAFFIC TYPES
Background
Best Effort
Excellent Effort
Critical Applications
Video, less than 100 ms latency and jitter
Voice, less than 10 ms latency and jitter
Internetwork Control
Network Control
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VID Len/Etype Data
Priority 802.1p Priority
Len/Etype Length and type of Ethernet frame
Data Frame data
FCS Frame Check Sequence
FCS IEEE 802.1Q
customer
tagged frame
Section