Chapter 19
| Class of Service Commands
Priority Commands (Layer 2)
– 474 –
Example
The following example shows how to assign round-robin weights of 1 - 8 to the
CoS priority queues 0 - 7.
Console(config)#interface ethernet 1/1
Console(config-if)#queue weight 1 2 3 4 5 6 7 8
Console(config-if)#
Related Commands
queue mode (472)
show queue weight (475)
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
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 2 of the output port. (Note that if the
