Operation Manual - QoS/ACL
Quidway S3500 Series Ethernet Switches Chapter 2 QoS Configuration
Huawei Technologies Proprietary
2-15
Perform the following configuration in system view.
Table 2-19 Tagging packet priority
Operation Command
Mark the packet
priority
traffic-priority { user-group { acl-number | acl-name } [ rule
rule ] | { ip-group { acl-number | acl-name } [ rule rule ] |
link-group { acl-number | acl-name } [ rule rule ] }* } { { dscp
dscp-value | ip-precedence { pre-value | from-cos } } | cos
{ pre-value | from-ipprec } | local-precedence pre-value }*
Cancel the packet
priority marking
undo traffic-priority { user-group { acl-number | acl-name }
[ rule rule ] | { ip-group { acl-number | acl-name } [ rule rule ] |
link-group { acl-number | acl-name } [ rule rule ] }* }
Ethernet Switch support a function to tag the packets with IP precedence (specified by
ip-precedence in the traffic-priority command), DSCP (specified by dscp in the
traffic-priority command) or 802.1p preference (specified by cos in the traffic-priority
command). You can tag the packets with different priorities at requirements on QoS
policy. The switch puts the packets into corresponding egress queues according to the
802.1p preference or the local preference (specified by local-precedence in the
traffic-priority command). If both the 802.1p preference and local preference have
been specified in the traffic-priority command, the switch will put the packets into
corresponding queues according to the 802.1p preference first.
For details about the command, refer to the Command Manual.
2.3.7 Configuring Queue Scheduling
Queue scheduling is commonly used to resolve the problem that multiple messages
compete for resource when the network congestion happens. The queue scheduling
function put the packet to output queue of the port according to 802.1p priority of the
packet. The mapping relationship between 802.1p priority and output queue of the port
is as followed table.
Table 2-20 Default “CoS → Local-precedence” mapping table
CoS Value Local Precedence
0 2
1 0
2 1
3 3
4 4
5 5
6 6
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