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C H A P T E R 8
138
Quality of Service (QoS)
802.1Q
type
8100
Destination
Source
address
address
Figure 14: Ethernet packet encapsulation
Observing 802.1p Information
When ingress traffic that contains 802.1p prioritization information
is seen by the switch, the traffic is mapped to various hardware
queues on the egress port of the switch. The 480T switch supports
8 hardware queues The hardware queue determines the bandwidth
management and priority characteristics used when transmitting
packets.
To control the mapping of 802.1p prioritization values to hardware
queues, 802.1p prioritization values may be mapped to a QoS
profile. The default mapping of each 802.1p priority value to QoS
profile is described in Table 33.
Table 33: 802.1p Priority Value-to-QoS Profile Mapping
Priority Value
0
1
2
3
4
802.1p
priority
VLAN ID
IP packet
QoS Profile
Qp1
Qp2
Qp3
Qp4
Qp5
802.1Q
CRC
480t_022
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