PLANET SGSD-1022 - Manual (Page 232)

User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
„ Service Policy Defines service policy settings for ports
VoIP Voice over IP
„ Configuration Sets a Voice VLAN ID and enables VoIP traffic detection
„ Port Configuration Configures port VoIP traffic mode, security, and priority
„ OUI Configuration Configures VoIP device OUI identification
4.10.1 Priority
Class of Service (CoS) allows you to specify which data packets have greater precedence when traffic is buffered in the
Managed Switch due to congestion. This Managed 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, and configure the mapping of frame priority tags to the Managed Switch’s priority queues.
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 Managed Switch provides four 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
„ Default Port Priority Sets the default priority for each port
„ IP Port Priority Sets IP port priority, mapping TCP/UDP ports to class-of-service queues
„ IP DSCP Priority Sets IP Differentiated Services Code Point priority, mapping a DSCP tag to a
class-of-service queue
„ IP Precedence Priority Sets IP precedence priority, mapping IP precedence values to class-of-service queues
„ IP TOS Priority Sets IP ToS priority, mapping IP ToS values to class-of-service queues
„ ACL CoS Priority Sets ACL priority, mapping IP and MAC ACLs to class-of-service queues
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