User manual

C HAPTER 4 | Configuring the Switch
Quality of Service
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3. Enter a MAC address that specifies the OUI for VoIP devices in the
network, and enter a description for the devices.
4. Click Save.
Figure 74: Configuring an OUI Telephony List
QUALITY OF SERVICE
All switches or routers that access the Internet rely on class information to
provide the same forwarding treatment to packets in the same class. Class
information can be assigned by end hosts, or switches or routers along the
path. Priority can then be assigned based on a general policy, or a detailed
examination of the packet. However, note that detailed examination of
packets should take place close to the network edge so that core switches
and routers are not overloaded.
Switches and routers along the path can use class information to prioritize
the resources allocated to different traffic classes. The manner in which an
individual device handles traffic is called per-hop behavior. All devices
along a path should be configured in a consistent manner to construct a
consistent end-to-end Quality of Service (QoS) solution.
This section describes how to specify which data packets have greater
precedence when traffic is buffered in the switch due to congestion. This
switch provides 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 queuing
mode, and queue weights.
The switch also allows you to configure QoS classification criteria and
service policies. The switch’s resources can be prioritized to meet the
requirements of specific traffic types on a per hop basis. Each packet is
classified upon entry into the network based on Ethernet type, VLAN ID,
TCP/UDP port, DSCP, ToS, or its VLAN priority tag. Based on configured
network policies, different kinds of traffic can be marked for different kinds
of forwarding.