3Com 3CRDSF9PWR-US User Guide - Page 170

Viewing CoS Settings, Defining CoS

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170 CHAPTER 13: CONFIGURING QUALITY OF SERVICE Viewing CoS Settings The CoS Summary Page displays the CoS default settings assigned to each port. To view CoS Settings: 1 Click Device > QoS > CoS > Summary. The CoS Summary Page opens: Figure 87 CoS Summary Page The CoS Summary Page contains the following fields: ■ Port - Displays the port for which the CoS default value is defined. ■ Default CoS - Displays the default CoS value for incoming packets for which a VLAN priority tag is not defined. The possible field values are 0-7. Defining CoS The CoS Setup Page allows the network administrator to set the priority for incoming untagged frames. The default priority applies for an untagged frame received on a port set to accept all frame types (i.e, receives both untagged and tagged frames). This priority does not apply to IEEE 802.1Q VLAN tagged frames. If the incoming frame is an IEEE 802.1Q VLAN tagged frame, the IEEE 802.1p User Priority bits will be used. This switch provides four priority queues for each port. Inbound frames that do not have VLAN tags are tagged with the input port's default ingress user priority, and then placed in the appropriate priority queue at

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170
C
HAPTER
13: C
ONFIGURING
Q
UALITY
OF
S
ERVICE
Viewing CoS Settings
The
CoS Summary Page
displays the CoS default settings assigned to
each port.
To view CoS Settings:
1
Click
Device > QoS > CoS > Summary
. The
CoS Summary Page
opens:
Figure 87
CoS Summary Page
The
CoS Summary Page
contains the following fields:
■
Port
— Displays the port for which the CoS default value is defined.
■
Default CoS
— Displays the default CoS value for incoming packets
for which a VLAN priority tag is not defined. The possible field values
are
0-7
.
Defining CoS
The
CoS Setup Page
allows the network administrator to set the priority
for incoming untagged frames.
The default priority applies for an untagged frame received on a port set
to accept all frame types (i.e, receives both untagged and tagged frames).
This priority does not apply to IEEE 802.1Q VLAN tagged frames. If the
incoming frame is an IEEE 802.1Q VLAN tagged frame, the IEEE 802.1p
User Priority bits will be used.
This switch provides four priority queues for each port. Inbound frames
that do not have VLAN tags are tagged with the input port’s default
ingress user priority, and then placed in the appropriate priority queue at