User guide

E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
9-13
T
RAFFIC
G
ROUPINGS AND
C
REATING A
Q
O
S P
OLICY
Figure 9-1: Ethernet packet encapsulation
O
BSERVING
802.1
P
I
NFORMATION
When ingress traffic that contains 802.1p prioritization information is detected by the
switch, the traffic is mapped to various hardware queues on the egress port of the
switch. Switches that use the “i” chipset support eight hardware queues, all other
products support four hardware queues. The transmitting 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 shown in Tab le 9-6.
Table 9- 6: 802.1p Priority Value-to-QoS Profile Default Mapping
Priority Value
QoS Profile
Summit Chipset
QoS Profile
“i” Chipset
0 Qp1 Qp1
1 Qp1 Qp2
2 Qp2 Qp3
3 Qp2 Qp4
4 Qp3 Qp5
5 Qp3 Qp6
6 Qp4 Qp7
7 Qp4 Qp8
EW_024
Source
address
802.1Q
type
802.1p
priority
802.1Q
VLAN ID
IP packet CRC
Destination
address
8100