Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
Note The switch does not allow a QoS IP-device priority for the Management VLAN
IP address, if configured. If there is no Management VLAN configured, then
the switch does not allow configuring a QoS IP-device priority for the Default
VLAN IP address.
Ip address QoS does not support layer-2 SAP incapsulation. For more infor-
mation on packet-type restrictions, refer to table
8-15, ‘‘Details of Packet
Criteria and Restrictions for QoS Support’’, on page 8-70.
Options for Assigning Priority. Priority control options for packets carry-
ing a specified IP address include:
■ 802.1p priority
■ DSCP policy (Assigning a new DSCP and an 802.1p priority; inbound
packets must be IPv4.)
(For operation when other QoS classifiers apply to the same traffic, refer to
“Classifiers for Prioritizing Outbound Packets” on page 8-9.)
For a given IP address, you can use only one of the above options at a time.
However, for different IP addresses, you can use different options.
Assigning a Priority Based on IP Address
This option assigns an 802.1p priority to all IPv4 packets having the specified
IP address as either a source or destination. (If both match, the priority for
the IP destination address has precedence.
)
Syntax: qos device-priority < ip-address > priority < 0 - 7 >
Configures an 802.1p priority for outbound packets
having the specified IP address. This priority deter-
mines the packet’s queue in the outbound port to which
it is sent. If the packet leaves the switch on a tagged
port, it carries the 802.1p priority with it to the next
downstream device. (Default: Disabled)
no qos device-priority < ip-address >
Removes the specified IP device-priority QoS classifier
and resets the priority for that VLAN to
No-override.
show qos device-priority
Displays a listing of all IP device-priority QoS classi-
fiers currently in the running-config file.
8-31
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