Planet Networking & Communication SGSD-1022, Руководство пользователя, Страница: 618 / 688

User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
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5.23 Class of Service Commands
The commands described in this section allow you to specify which data packets have greater precedence when traffic is
buffered in the switch due to congestion. This switch supports CoS with four priority queues for each port. Data packets in a
port’s high-priority queue will be transmitted before those in the lower-priority queues. You can set the default priority for each
interface, the relative weight of each queue, and the mapping of frame priority tags to the switch’s priority queues.
Command Group Function
Priority (Layer 2) Configures default priority for untagged frames, sets queue weights, and
maps class of service tags to hardware queues
Priority (Layer 3 and 4) Maps IP port and IP DSCP, Precedence, and TOS values to class of
service queues
Table 5-76 Priority Commands
5.23.1 Priority Commands (Layer 2)
This section describes commands used to configure Layer 2 traffic priority on the switch.
Command Function Mode
queue mode Sets the queue mode to strict priority, Weighted Round-Robin
(WRR), or hybrid
GC
switchport priority default Sets a port priority for incoming untagged frames IC
queue bandwidth Assigns round-robin weights to the priority queues GC
queue cos map Assigns class-of-service values to the priority queues IC
show queue mode Shows the current queue mode PE
show queue bandwidth Shows round-robin weights assigned to the priority queues PE
show queue cos-map Shows the class-of-service map PE
show interfaces switchport Displays the administrative and operational status of
aninterface
PE
Table 5-77 Priority Commands (Layer 2)
queue mode
This command sets the queue mode to strict priority, Weighted Round-Robin (WRR), or or a combination of both for the class of
service (CoS) priority queues. Use the no form to restore the default value.
Syntax
queue mode {strict | wrr | hybrid}
no queue mode
•
strict - Services the egress queues in sequential order, transmitting all traffic in the higher priority queues before