3com 2924-PWR Manual De Usuario
13
C
ONFIGURING
Q
UALITY
OF
S
ERVICE
Quality of Service (QoS) provides the ability to implement QoS and priority
queuing within a network. For example, certain types of traffic that
require minimal delay, such as Voice, Video, and real-time traffic can be
assigned a high priority queue, while other traffic can be assigned a lower
priority queue. The result is an improved traffic flow for traffic with high
demand. QoS is defined by:
queuing within a network. For example, certain types of traffic that
require minimal delay, such as Voice, Video, and real-time traffic can be
assigned a high priority queue, while other traffic can be assigned a lower
priority queue. The result is an improved traffic flow for traffic with high
demand. QoS is defined by:
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Classification — Specifies which packet fields are matched to specific
values. All packets matching the user-defined specifications are
classified together.
values. All packets matching the user-defined specifications are
classified together.
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Action — Defines traffic management where packets are forwarded
are based on packet information, and packet field values such as
VLAN Priority Tag (VPT) and DiffServ Code Point (DSCP).
are based on packet information, and packet field values such as
VLAN Priority Tag (VPT) and DiffServ Code Point (DSCP).
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VPT Classification Information — VLAN Priority Tags (VPT) are used
to classify packets by mapping packets to one of the egress queues.
VPT to Queue assignments are user-definable. Packets arriving
untagged are assigned a default VPT value, which is set on a per-port
basis. The assigned VPT is used to map the packet to the egress
queue.
to classify packets by mapping packets to one of the egress queues.
VPT to Queue assignments are user-definable. Packets arriving
untagged are assigned a default VPT value, which is set on a per-port
basis. The assigned VPT is used to map the packet to the egress
queue.
This section contains information for configuring QoS, and includes the
following topics:
following topics:
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