Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
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 on a tagged port, it
carries the 802.1p priority with it to the next down-
stream device. (Default:
No-override)
Syntax: no vlan < vid > qos
Removes QoS classifier for the specified VLAN.
Syntax: show qos device-priority
Displays a listing of all QoS VLAN-ID classifiers cur-
rently in the running-config file.
For example, suppose you wanted to assign this set of priorities:
VLAN-ID DSCP Priority
40 000111 7
30 000101 5
20 000010 1
1 000010 1
1. Determine whether the DSCPs already have priority assignments, which
could indicate use by existing applications. This is not a problem as long
as the configured priorities are acceptable for all applications using the
same DSCP. (Refer to the
“Note On Changing a Priority Setting” on page
8-65. Also, a DSCP must have a priority configured before you can assign
any QoS classifiers to use it.)
The DSCPs for this
example have not yet
been assigned an
802.1p priority level.
Figure 8-28. Display the Current Configuration in the DSCP Policy Table
8-55
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