PLANET SGSD-1022 - Manual (Page 231)

User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
4.10 Quality of Service
This Managed Switch prioritizes each packet based on the required level of service, using four priority queues with strict priority,
Weighted Round Robin, or hybrid queuing. It uses IEEE 802.1p and 802.1Q tags to prioritize incoming traffic based on input
from the end-station application. These functions can be used to provide independent priorities for delay-sensitive data and
best-effort data.
This Managed Switch also supports several common methods of prioritizing layer 3/4 traffic to meet application requirements.
Traffic can be prioritized based on the IPv4 header Type-of-Service field using DSCP, IP Precedence, IP TOS values, or
TCP/UDP port numbers. When these services are enabled, the priorities are mapped to a Class of Service output queue.
Quality of Service – Differentiated Services (DiffServ) provides policy-based management mechanisms used for prioritizing
network resources to meet the requirements of specific traffic types on a per-hop basis. Each packet is classified upon entry into
the network based on access lists, IP Precedence or DSCP values, or VLAN lists. Using access lists allows you select traffic
based on Layer 2, Layer 3, or Layer 4 information contained in each packet. Based on network policies, different kinds of traffic
can be marked for different kinds of forwarding.
This section has the following items:
Priority
„ Default Port Priority Sets the default priority for each port
„ Default Trunk Priority Sets the default priority for each trunk
„ Traffic Classes Maps IEEE 802.1p priority tags to output queues
„ Queue Mode Sets queue mode to strict, Weighted Round-Robin, or hybrid
„ Queue Scheduling Configures Weighted Round Robin queueing
„ IP DSCP Priority Status Globally enables DSCP priority
„ IP DSCP Priority Sets IP Differentiated Services Code Point priority, mapping a DSCP tag to a
class-of-service queue
„ IP Port Priority Status Globally enables IP port priority
„ IP Port Priority Sets IP port priority, mapping TCP/UDP ports to class-of-service queues
„ IP Precedence Priority
Status
Globally enables IP precedence priority
„ IP Precedence Priority Sets IP precedence priority, mapping IP precedence values to class-of-service
queues
„ IP TOS Priority Status Globally enables IP ToS priority
„ 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
DiffServ Configures QoS classification criteria and service policies
„ Class Map Sets Class Maps
„ Policy Map Sets Policy Maps
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