SMC Networks TigerAccess SMC7816M Manual do Utilizador descarregar pdf (Página 367)

100

101

14-1

HAPTER

LASS

ERVICE

Class of Service (CoS) allows you to specify which data packets have

greater precedence when traffic is buffered in the switch due to

congestion. This switch supports CoS with eight 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, and configure the mapping of frame priority tags to the switch’s

priority queues.

Layer 2 Queue Settings

Setting the Default Priority for Interfaces

You can specify the default port priority for each interface on the switch.

All untagged packets entering the switch are tagged with the specified

default port priority, and then sorted into the appropriate priority queue at

the output port.

Command Usage

• This switch provides eight priority queues for each port. It uses

Weighted Round Robin to prevent head-of-queue blockage.

• 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.

• If the output port is an untagged member of the associated VLAN, these

frames are stripped of all VLAN tags prior to transmission.

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