Priority Mapping; Specifications - 3Com 4200G 12-Port Configuration Manual

Traffic-based Traffic
Statistics
VLAN Tag Remark

Priority Mapping

Table 187 Queue-scheduling sequence of SDWRR
Scheduling
algorithm Queue-scheduling sequence
WRR 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1
SDWRR 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0
The function of traffic-based traffic statistics is to use ACL rules in traffic identifying
and perform traffic statistics on the packets matching with the ACL rules. You can get
the statistics of the packets you are interested in through this function.
The function of VLAN tag remark is to use ACL rules in traffic identifying and perform
VLAN tag remark operation on the packets matching with the ACL rules. The VLAN ID
of corresponding packets can be modified as you require.
The policy VLAN feature can be implemented through the VLAN tag remark function.
When the packet enters the switch, the switch will assign a series of parameters
(including 802.1p priority, DSCP precedence, local precedence, drop precedence and
so on) to it according to the priorities that the switch supports and the corresponding

specifications.

Among the parameters, the definitions of local precedence and drop precedence are
as follows:
Local precedence: Local precedence is the precedence that the device assigns to
■
packets locally and it is corresponding to the queue of the outbound port.
Drop precedence: Drop precedence is an argument that is referred to when the
■
operation of dropping packets is performed. 1 matches with red packets and 0
matches with green packets.
The device provides two types of priority trust modes:
Trusting the packet priority
■
Trusting the port priority
■
The priority mapping process of packets on the device is described in Figure 71:
Figure 71 Diagram for the priority mapping process
Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets Packets
N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N
Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y
Trust the port priority Trust the port priority
Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port Receiving port
Priority Mapping 221
Description
0 indicates packets in
queue0
1 indicates packets in
queue1
Search for the priority mapping table Search for the priority mapping table
and assign precedence for the packets and assign precedence for the packets
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Replace the 802.1p priority carried in Replace the 802.1p priority carried in
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