Owner's Manual

Chapter 15. QoS | 363
NETGEAR 8800 User Manual
Figure 22. 802.1p Priority Bits
The three 802.1p priority bits define up to 8 traffic groups that are predefined in the XCM8800
software.
On NETGEAR 8800 switches, the traffic groups direct traffic to egress QoS profiles for
egress rate shaping (see
Table 44).
You do not need to define 802.1p-based traffic groups. You can enable or disable the use of
these traffic groups by enabling or disabling the 802.1p examination feature. You can also
configure which 802.1p values map to which QoS profiles.
A related feature is the 802.1p replacement feature, which allows you to configure the
software to replace the 802.1p bits in an ingress frame with a different value in the egress
frame. For more information on 802.1p replacement, see
Configuring 802.1p or DSCP
Replacement on page 374.
DiffServ-Based Traffic Groups
DiffServ-based traffic groups forward traffic to egress QoS profiles based on the
Type-of-Service (TOS) information in an IP packet. In many systems, this type-of-service
information is replaced with a DiffServ field that uses 6 of the 8 bits for a DiffServ code point
(DSCP) as shown in
Figure 23. (The other two bits are not used.)
EW_024
Source
address
802.1Q
type
802.1p
priority
802.1Q
VLAN ID
IP packet CRC
Destination
address
8100