Priority Commands
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4
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 Port, IP Precedence or IP DSCP,
and 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.
• This switch provides four priority queues for each port. It is configured to use
Weighted Round Robin, which can be viewed with the show queue
bandwidth 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 0 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.)
Example
The following example shows how to set a default priority on port 3 to 5:
queue bandwidth
Use this command to assign weighted round-robin (WRR) weights to the four class
of service (CoS) priority queues. Use the no form to restore the default weights.
Syntax
queue bandwidth weight1...weight4
no queue bandwidth
weight1...weight4 - The ratio of weights for queues 0 - 3 determines the
weights used by the WRR scheduler. (Range: 1 - 255)
Default Setting
Weights 1, 4, 16 and 64 are assigned to queue 0, 1, 2 and 3 respectively.
Command Mode
Global Configuration
Console(config)#interface ethernet 1/3
Console(config-if)#switchport priority default 5
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