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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
No t e A codepoint must have an 802.1p priority (0 - 7) before you can configure the
codepoint for use in prioritizing packets by VLAN-ID. If a codepoint you want
to use shows No-override in the Priority column of the DSCP Policy table (show
qos dscp-map), then assign a priority before proceeding.
4. Configure the switch to assign the DSCP policy to packets with the
specified VLAN-ID.
Syntax: qos dscp-map < codepoint > priority < 0 - 7 >
This command is optional if a priority has already
been assigned to the < codepoint >. The command creates
a DSC
P policy by assigning an 802.1p priority to a
s
pecific DSCP. When the switch applies this priority to
a packet, the priority determines the packet’s queue in
the outbound port to which it is sent. If the packet leaves
t
he switch in a tagged VLAN, it carries the 802.1p
priority with it to the next downstream device. If the
packet
is IPv4, the packet’s DSCP will be replaced by the
codepoint specified in this command. (Default: For
most codepoints,
No-override. See figure 15-8 on page
15-52.)
Syntax: vlan < vid > qos dscp < codepoint >
Assigns a DSCP policy to packets carrying the specified
IP address, and overwrites the DSCP in these packets
with the assigned <
codepoint > value. This policy
includes an 802.1p priority and determines the
packet
’s queue in the outbound port to which it is sent.
If the packet leaves the switch in a tagged VLAN, it
c
arries the 802.1p priority with it to the next down-
stream device. (Default:
No-override)
no vlan < vid > qos
Removes QoS classifier for the specified VLAN.
show qos device-priority
Displays a listing of all QoS VLAN-ID classifiers cur-
rently in the running-config file.
15-42