3Com 4210 PWR, Configuration Manual

Page: 309 / 567

QoS Configuration 307
Although the burst function helps reduce the packet loss ratio and improve packet
processing capability in the networks mentioned above, it may affect QoS
performance. So, use this function with caution.
QoS Configuration
Configuring Port Priority By default, for a packet with an 802.1q tag header, a switch replaces the 802.1p
precedence of a packet with the priority of the receiving port and looks up the
new 802.1p precedence in the 802.1p-precedence-to-local-precedence mapping
table for the corresponding local precedence, and then assigns the local
precedence to the packet for it to be added an output queue.
Configuration prerequisites
■
The port whose port priority is to be configured is determined.
■
The target priority value is determined.
Configuration procedure
Configuration example
■
Configure port priority on Ethernet 1/0/1 and set the priority of Ethernet 1/0/1
to 7.
<4210> system-view
[4210] interface Ethernet1/0/1
[4210-Ethernet1/0/1] priority 7
Table 226 QoS configuration tasks
Task Remarks
Configuring Port Priority Optional
Configuring to Trust the 802.1p
Precedence of the Received Packets Optional
Configuring Priority Trust Mode Optional
Configuring Priority Mapping Optional
Configuring Port Rate Limiting Optional
Configuring Queue Scheduling Optional
Enabling the Burst Function Optional
Displaying QoS Optional
Table 227 Configure port priority
Operation Command Description
Enter system view system-view
Enter Ethernet port view
interface interface-type
interface-number
Configure port priority priority priority-level
Optional
0 by default