3Com 7700 Configuration Manual page 159

Perform the following configuration in Ethernet port view.
Table 10 Configure Rate Limit
Operation
Configure the flow-based rate limit traffic-limit { inbound | outbound } { ip-group {
Cancel the configuration of the
flow-based rate limit
You have to define the corresponding ACL before performing this configuration
task.
The purpose of this configuration task is to implement traffic policing over the
data flow matching the ACL. The traffic beyond the limit will be dealt with in
some other way, such as discarding.
For details about the command, refer to the "3Com Command Reference Guide".
Configure Priority Marking
Configuring priority-marking creates a policy to tag the priority of the packets so
they match the ACL. The new priority can be filled in the priority field of the
packet header.
Perform the following configuration in Ethernet port view.
Table 11 Tag Packet Priority
Operation
Mark the packet priority
Cancel the packet priority marking
The Switch 7700 supports a function to tag the packets with IP precedence
(specified by ip-precedence in the traffic-priority command), or DSCP (specified by
dscp in the traffic-priority command). You can tag the packets with different
priorities at requirements on QoS policy.
For details about the command, see the "3Com Command Reference Guide."
Configure Queue Scheduling
Queue scheduling is commonly used to resolve the problems that occur when
multiple messages compete for resources when there is network congestion.
The switch only supports SP queue scheduling, but it can put the data into the
appropriate sending queue depending on the DSCP priority, IP preference, COS
priority, or local preference. You can determine which priority is used through
command.
Command
acl-number | acl-name } [ rule rule ] | link-group {
acl-number | acl-name } [ rule rule ] } target-rate
undo traffic-limit { inbound | outbound } { ip-group {
acl-number | acl-name } [ rule rule ] | link-group {
acl-number | acl-name } [ rule rule ] }
Command
traffic-priority outbound { ip-group { acl-number |
acl-name } [ rule rule ] | link-group { acl-number |
acl-name } [ rule rule ] } { [ dscp dscp-value |
ip-precedence pre-value ] [ local-precedence pre-value
] }
undo traffic-priority { ip-group { acl-number |
acl-name } [ rule rule ] | link-group { acl-number |
acl-name } [ rule rule ] }
QoS Overview 151