Netgear XCM8806 Chassis User Manual - Page 363

NETGEAR 8800 User Manual 802.1Q type 8100 802.1p priority 802.1Q VLAN ID Destination address Source address Figure 22. 802.1p Priority Bits IP packet CRC EW_024 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.) Chapter 15. QoS | 363