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3Com Switch 7750 Series
Command Reference Guide – QoS Chapter 1 QoS Commands
1-14
<3Com> system-view
[3Com] interface Ethernet1/0/1
[3Com-Ethernet1/0/1] priority 7
1.1.16 priority trust
Syntax
priority-trust { dscp | ip-precedence | cos | local-precedence }
View
System view
Parameter
dscp: Puts a packet into the corresponding output queue on a port according to the
DSCP precedence.
ip-precedence: Puts a packet into the corresponding output queue on a port according
to the IP precedence.
cos: Puts a packet into the corresponding output queue on a port according to the COS
precedence.
local-precedence: Puts a packet into the corresponding output queue on a port
according to the local precedence.
Description
Use the priority trust command to specify the priority according to which the switch
puts a packet into the output queue on a port.
By default, the switch puts a packet into the output queue on a port according to the
local precedence of the packet.
The switch ports support eight output queues with different levels of precedence. The
higher the precedence is, the earlier it will be delivered. The switch puts a packet into
an output queue on a port according to the precedence of the packet.
z dscp precedence: dscp precedence value ranges from 0 to 63 inclusive, the
packets with precedence value from 0 to 7 are put into queue 0, and those with
precedence value from 8 to 15 are put into queue 1, and so on.
z ip-precedence: ip-precedence value ranges from 0 to 7, the packets with
precedence value 0 are put into queue 0, and those with precedence value 1 are
put into queue 1, and so on.