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To configure Basic QoS mode:
1. S
elect Basic mode for the system by using the Feature Configuration page.
2. Select the trust-behavior using the Basic QoS page. The device supports CoS/802.1p
trusted mode and DSCP trusted mode. CoS/802.1p trusted mode uses the 802.1p
priority in the VLAN tag. DSCP trusted mode use the DSCP value in the IP header.
In Basic QoS Mode, it is recommended that you disable the trusted mode at the ports where the
CoS/802.1p and/or DSCP values of the incoming packets are not trustworthy. Otherwise, it might
negatively affect the performance of your network. Incoming packets from ports that are disabled
without trust mode are forwarded in best effort.
Basic QoS
The Basic QoS page contains information for enabling Trust on the device.
This configuration is only active when the QoS mode is Basic mode. Packets entering a QoS
domain are classified at the edge of the QoS domain.
To define the Trust configuration:
1. Click Configuration > Quality of Service > Basic QoS.
2. Select the Trust Mode while the device is in Basic mode. The Trust mode determines th
e
q
ueue to which the packet is assigned:
•
CoS/802.1p—Traffic is mapped to queues based on the VPT field in the VLAN tag,
or based on the per-port default CoS/802.1p value (if there is no VLAN tag on the
incoming packet), the actual mapping of the VPT to queue can be configured in the
mapping CoS/802.1p to Queue page.
•
DSCP—All IP traffic is mapped to queues based on the DSCP field in the IP header.
The actual mapping of the DSCP to queue can be configured in the DSCP to Queu
e
p
age. If traffic is not IP traffic, it is mapped to the best effort queue.
•
CoS/802.1p-DSCP—All IP traffic is mapped to queues based on the values in thei
r
D
SCP field. All non IP traffic is mapped to queues based on the their CoS/802.1p
value.
To disable QoS on a port, click Edit, select a port or LAG, deselect Enable QoS.
3. Click Apply. The Running Configuration file is updated with the new settings.
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