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5-13
Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
Viewing the QoS Configuration
The following show commands are available on the switches covered in this
guide. Examples of the show qos output are included with the example for
each priority type.
No Override
By default, the IP ToS, Protocol, and (source) port show outputs automatically
list No-override for priority options that have not been configured. This means
that if you do not configure a priority for a specific option, QoS does not
prioritize packets to which that option applies, resulting in the No override
state. In this case, IP packets received through a VLAN-tagged port receive
whatever 802.1p priority they carry in the 802.1Q tag in the packet’s header.
VLAN-Tagged packets received through an untagged port are handled in the
switch with “normal” priority.
Syntax: show qos < priority-classifier >
dscp-map
Show mappings between DSCP policy and 802.1p pri-
ority.
port-priority
Displays the current source-port priority configura-
tion. Refer to figure 5-11 on page 5-28.
type-of-service
Displays the current type-of-service priority configu-
ration. The display output differs according to the ToS
option used:
■ IP Precedence: Refer to figure 5-3 on page 5-16.
■ Diffserve: Refer to figure 5-5 on page 5-19.