3Com Switch 4200G Configuration Guide

Priority Mapping 221
Traffic-based Traffic
Statistics
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.
VLAN Tag Remark 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.
Priority Mapping 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
Table 187 Queue-scheduling sequence of SDWRR
Scheduling
algorithm
Queue-scheduling sequence Description
WRR 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1 0 indicates packets in
queue0
1 indicates packets in
queue1
SDWRR 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0
Y
N
Search for the priority mapping table
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
Trust the port priority
N
and assign precedence for the packets
according to the precedence of the
packets following the priority trust mode
on the receiving port
Replace the 802.1p priority carried in
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
Search for the priority mapping table
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets
Y
N
according to the precedence of the
packets following the priority trust mode
on the receiving port
the packet with the precedence of the
receiving port and search the precedence
mapping and
assign local precedence and drop
precedence for the packet
Y
N
Receiving port
Packets
Y
Trust the port priority
N
and assign precedence for the packets
according to the precedence of the
packets following the priority trust mode
on the receiving port
Replace the 802.1p priority carried in
the packet with the precedence of the
receiving port and search the precedence
mapping and
precedence for the packet
Y
N
Receiving port
Packets