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Configuring Quality of Service
332
ProSafe M5300 Switch
From the Class of Service link under the QoS tab, you can access the following pages:
• Basic on page 332
• Advanced on page 333
Basic
From the Basic link, you can access the following pages:
• CoS Configuration on page 332
CoS Configuration
To display the CoS Configuration page, click QoS CoS Basic CoS Configuration.
Use the CoS Configuration page to set the class of service trust mode of an interface. Each
port in the switch can be configured to trust one of the packet fields (802.1p or IP DSCP), or
to not trust any packet’s priority designation (untrusted mode). If the port is set to a trusted
mode, it uses a mapping table appropriate for the trusted field being used. This mapping
table indicates the CoS queue to which the packet should be forwarded on the appropriate
egress port(s). Of course, the trusted field must exist in the packet for the mapping table to be
of any use, so there are default actions performed when this is not the case. These actions
involve directing the packet to a specific CoS level configured for the ingress port as a whole,
based on the existing port default priority as mapped to a traffic class by the current 802.1p
mapping table.
Alternatively, when a port is configured as untrusted, it does not trust any incoming packet
priority designation and uses the port default priority value instead. All packets arriving at the
ingress of an untrusted port are directed to a specific CoS queue on the appropriate egress
port(s), in accordance with the configured default priority of the ingress port. This process is
also used for cases where a trusted port mapping is unable to be honored, such as when a
non-IP packet arrives at a port configured to trust the IP DSCP value.
To configure global CoS settings:
1. Use Global to specify all CoS configurable interfaces. The option “Global” represents
the most recent global configuration settings.
2. Use Interface to specify CoS configuration settings based per-interface.