3Com 4200G 12-Port Configuration Manual page 236

4200g series switch
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222
C
27: Q
S C
HAPTER
O
Trusting the 802.1p
priority of the Packets
Trusting the DSCP
Precedence of the
Packets
ONFIGURATION
You can select the priority trust mode of the port as you require.
In the mode of trusting the packet precedence, the switch can trust the following
priorities as you configure:
Trust the 802.1p priority of the packets
Trust the DSCP precedence of the packets
You can specify whether to replace the precedence carried in the packet with the
mapped precedence when you configure to trust the 802.1p priority of the packet:
In the default mode, the switch does not replace the precedence carried in the
packet with the mapped precedence.
In the automap mode, the switch replaces the precedence carried in the packet
with the mapped precedence.
If the packet does not carry any precedence, the switch will perform the
corresponding mapping by using the port precedence to search for the "COS->other
priority mapping table".
Figure 72 The mapping process of trusting 802.1p priority
Packets
Packets
Packets
Packets
Packets
Packets
Packets
Packets
You can specify whether to replace the precedence carried in the packet with the
mapped precedence when you configure to trust the DSCP precedence of the packet:
In the default mode, the switch does not replace the precedence carried in the
packet with the mapped precedence.
In the automap mode, the switch replaces the precedence carried in the packet
with the mapped precedence.
In the remap mode, the switch firstly gets new DSCP precedence by the "DSCP-->
DSCP" mapping relationship, and then searches for the "DSCP-->other
precedence" mapping table through the new DSCP precedence and replaces the
precedence carried in the packet with the mapped precedence.
"COS - > other precedence" mapping table
"COS - > other precedence" mapping table
>
>
>
>
>
>
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
802.1p
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Local -pre
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
Drop
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
6
6
6
6
6
6
6
6
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6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
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7
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7
7
7
7
7
7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Search for "COS-
Search for "COS-
Search for "COS-
Search for "COS-
"COS->other precedence" mapping table
"COS-
"COS->other precedence" mapping table
"COS-
according to the COS (802.1p precedence) and
according to the COS (802.1p precedence) and
according to the COS (802.1p precedence) and
according to the COS (802.1p precedence) and
according to the COS (802.1p precedence) and
according to the COS (802.1p precedence) and
according to the COS (802.1p precedence) and
according to the COS (802.1p precedence) and
assign other precedence for the packet
assign other precedence for the packet
assign other precedence for the packet
assign other precedence for the packet
assign other precedence for the packet
assign other precedence for the packet
assign other precedence for the packet
assign other precedence for the packet
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
DSCP
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
8
8
8
8
8
8
8
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8
8
8
8
8
8
24
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24
32
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40
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48
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56
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56
Packets
Packets
Packets
Packets
Packets
Packets
Packets
Packets

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