CLI Reference Guide-R03

Chapter 20 | Class of Service Commands
Priority Commands (Layer 2)
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Example
The following example shows how to assign round-robin weights of 1 - 8 to the CoS
priority queues 0 - 7.
Console(config)#queue weight 1 2 3 4 5 6 7 8
Console(config)#
Related Commands
queue mode (506)
show queue weight (509)
switchport
priority default
This command sets a priority for incoming untagged frames. Use the no form to
restore the default value.
Syntax
switchport priority default default-priority-id
no switchport priority default
default-priority-id - The priority number for untagged ingress traffic. The
priority is a number from 0 to 7. Seven is the highest priority.
Default Setting
The priority is not set, and the default value for untagged frames received on the
interface is zero.
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
◆ The precedence for priority mapping is IP DSCP, and then default switchport
priority.
◆ The default priority applies for an untagged frame received on a port set to
accept all frame types (i.e, receives both untagged and tagged frames). This
priority does not apply to IEEE 802.1Q VLAN tagged frames. If the incoming
frame is an IEEE 802.1Q VLAN tagged frame, the IEEE 802.1p User Priority bits
will be used.
◆ The switch provides eight priority queues for each port. It can be configured to
use strict priority queuing, Weighted Round Robin (WRR), or a combination of
strict and weighted queuing using the queue mode command. Inbound frames
that do not have VLAN tags are tagged with the input port's default ingress
user priority, and then placed in the appropriate priority queue at the output
port. The default priority for all ingress ports is zero. Therefore, any inbound
frames that do not have priority tags will be placed in queue 1 of the output
port. (Note that if the output port is an untagged member of the associated
VLAN, these frames are stripped of all VLAN tags prior to transmission.)