3Com 5500 SI - Switch - Stackable, Configuration Manual

Page: 365 / 686

QoS Configuration 365
You should first define an ACL before this configuration task.
The granularity of traffic limit is 64kbps. If the target-rate user input is in ( N*64,
(N+1)*64], in which N is a natural number, Switch automaticaly sets (N+1)*64 as the
parameter value.
This configuration achieves rate control for those packets that match the ACL. If the
traffic rate threshold is exceeded, corresponding measures will be taken, for example,
dropping excessive packets.
Setting Line Limit Line limit refers to rate limit based on the port, that is, limiting the total rate at the
port. The granularity of line rate is 64 kbps.
Perform the following configurations in the Ethernet Port View.
Table 383 Setting Line Rate
Relabeling Priority Level This configuration re-labels priority level for the packets that match ACL. The new
priority label can be put in the priority domain in the header.
Perform the following configurations in the Ethernet Port View.
Table 384 Relabeling Priority Level
Configuring Traffic
Statistics
The traffic statistics function is used for counting the data packets of the specified
traffic, that is, this function counts the transmitted data which matches the ACL rules.
After the traffic statistics function is configured, the user can use
display
qos-interface traffic-statistic
command to display the statistics information.
You can use the following command to configure traffic statistics.
Perform the following configuration in the Ethernet Port View.
Remove traffic
limit
undo traffic-limit inbound { user-group acl_number [
rule rule ] | ip-group acl-number [ rule rule [ link-group
acl_number rule rule ] ] | link-group acl_number [ rule
rule ] }
Operation Command
Operation Command
Set line limit
line-rate { inbound | outbound } target_rate
Remove line limit
undo line-rate{ inbound | outbound }
Operation Command
Relabel traffic priority
traffic-priority { inbound | outbound } { user-group
acl-number [ rule rule ] | ip-group acl_number [ rule
rule [ link-group acl_number rule rule ] ] |
link-group acl_number [ rule rule ] } { { dscp
dscp_value | ip-precedence { pre_value | from-cos }
} | cos { pre_value | from-ipprec } | local-precedence
pre_value }*
Remove the setting
undo traffic-priority { inbound | outbound } {
user-group
acl_number [ rule rule ] | ip-group
acl-number [ rule rule [ link-group acl_number rule
rule ] ] | link-group acl_number [ rule rule ] }