ATL Telecom R1-SW Ethernet Switch - Manual (Page 200)

R1-SW24L2B User’s Manual
9-32
Configuring Non-Class-map QoS Features
The previous sections describe QoS features for the traffics classified by class maps(classifiers).
The Corecess R1-SW24L2B has QoS features which can be applied without classifiers. This
section describes how to configure these non-class-map QoS features.
Configuring CoS (Class of Service)
QoS classifies traffic by assigning priority-indexed 802.1p class of service (CoS) values to frames
at ingress ports. If traffic is tagged with a CoS value at the ingress port, the switch forwards the
value. If traffic is native, then the switch can rewrite the CoS tag. QoS implements scheduling
on supported egress ports based on the 802.1p CoS values to give preference to higher-priority
traffic.
By default, 802.1p CoS is disabled on the Corecess R1-SW24L2B. When the 802.1p CoS is
disabled, the IP precedence and DSCP values are used for QoS. To enable the 802.1p CoS and
assign the priority to a interface for 802.1p class of service, perform this task in the Global
configuration mode:
Table 9-10 Configuring CoS value
Command Task
qos 1. Enter QoS configuration mode.
8021p enable 2. If necessary, enable 802.1p class of service on the system.
8021p user-priority
<priority> vlan <vlan-id>
[port <port-type>
<slot>/<port>]
3. Assigns the priority to the specific VLAN interface.
y <priority>: The priority (0 ~ 7)
y <vlan-id>: VLAN ID (1 ~ 4094)
y <port-type>: Type of the port (gigabitethernet, fastethernet).
y <slot>/<port>: Slot number and port number of the port.
8021p enable
4. Apply the configuration of step 2 to the system. After this command
is executed, the priority is applied.
end 5. Return to the privileged mode.
show user-priority 6. Verify the assigned CoS value.
write memory 7. Save the configuration changes.
Note : If you do not specify the port, assigned priority are applied to all ports in the specified VLAN.