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Quality of Service
QoS Properties
Cisco Small Business SG200 Series 8-port Smart Switch 165
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The switch supports four egress queues for each port or LAG. Queue1 has the
lowest priority and queue 4 has the highest priority.
The pages in the Quality of Service menu enable you to define the properties of
the queues, and to associate to the queues the traffic that has particular
characteristics or arrives on specific interfaces. You can also create rate limit
profiles that define criteria for determining if a port is receiving more traffic than it
can handle. You can then assign the rate limit profiles to ports.
QoS Properties
You can configure switch ports to assign traffic to egress queues based on the
priority information encoded in Ethernet frames or IP packet headers. Or traffic
might use a default priority value configured on the port where it arrives. When a
port is configured to use the encoded priority value [such as the 802.1p, IP
precedence, or DSCP (Differentiated Services Code Point) value], it is considered
a trusted port. A port that is configured to use its own priority value, rather than the
value encoded in the frame or packet, to make queue assignment decisions is
considered untrusted.
If a port is configured as trusted but the frame or packet does not have priority
information, the default port priority is assigned to the packet. The default port
priority is zero.
You can use the Interface Settings page to change the value of the VLAN Priority.
You can use the QoS Properties page to define a port as trusted or untrusted and
to configure which priority values it trusts.
To configure the trust mode on a port or LAG:
STEP 1 Click Quality of Service > QoS Properties in the navigation window.
STEP 2 Select a filter from the Interface Type menu to display ports or LAGs in the Trust
Mode Configuration Table.
STEP 3 Select the interface to configure and click Edit.
STEP 4 To specify the type of priority values to use to determine the egress queues of the
packets, select one of the following trust modes:
• untrusted—The port assigns its own default 802.1p priority (0).
• trust dot1p—The port uses the 802.1p priority value in VLAN-tagged
Ethernet frames. For untagged frames, the default priority is assigned.