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分类: LINUX

2017-09-06 03:12:55

WMM maps the TOS (type of service) field present in the 802.3 packet from the IP stack to the WLANaccess categories as mentioned in Table 5-14 and Figure 5-29.

Table 5-15 TID to AC Conversion:
TID Access Category
0, 3 WME_AC_BE
1, 2 WME_AC_BK
4, 5 WME_AC_VI / WME_AC_VO

The macro TID_TO_WME_AC converts the given TID to the respective access category.
When QoS is enabled, the default priority is set to WME_AC_BE.
When a VLAN is present, a VLAN tag associated with the packet can be used to derive VLAN priority.
This VLAN priority is directly mapped to the TID.
If a VLAN tag is not present and the packet is operating under IEEE 802.1p, then the VLAN priority is
derived from the VLAN TCI field.
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