SMC Networks SMC TigerStack III SMC6824MPE - Manual (Page 509)

P
RIORITY
C
OMMANDS
4-247
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)
Console(config)#interface ethernet 1/3
Console (config-if)#switchport priority default 5