| Class of Service Commands
Priority Commands (Layer 2)
The following example shows how to assign round-robin weights of 1 - 4 to the CoS
priority queues 0 - 3.
Console(config)#queue weight 1 2 3 4
queue mode (430)
show queue weight (433)
This command sets a priority for incoming untagged frames. Use the no form to
restore the default value.
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.
The priority is not set, and the default value for untagged frames received on the
interface is zero.
Interface Configuration (Ethernet, Port Channel)
The precedence for priority mapping is IP DSCP, and then default switchport
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 four 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
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.)
– 432 –
command. Inbound frames