Configuring Quality of Service
Configuring QoS
Cisco Small Business 300 Series Managed Switch Administration Guide 255
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Configuring Bandwidth
The Bandwidth Page enables network managers to define two sets of values that
determine how much traffic the system can receive and send.
The ingress rate limit is the number of bits per second that can be received from
the ingress interface. Excess bandwidth above this limit is discarded.
The following values are entered for egress shaping:
• Committed Information Rate (CIR) sets the average maximum amount of data
allowed to be sent on the egress interface, measured in bits per second
• Committed Burst Shape (CBS) is the burst of data that is allowed to be sent,
even though it is above the CIR. This is defined in number of bytes of data.
To enter bandwidth limitation:
STEP 1 Click Quality of Service > General > Bandwidth. The Bandwidth Page opens.
The Bandwidth Page displays bandwidth information for each interface.
The % column is the ingress rate limit for the port divided by the total port
bandwidth.
STEP 2 Select an interface, and click Edit. The Edit Bandwidth Page opens.
STEP 3 Select the Port/LAG interface.
STEP 4 Enter the fields for the selected interface:
• Ingress Rate Limit—Select to enable the ingress rate limit, which is defined
in the field below.
• Ingress Rate Limit—Enter the maximum amount of bandwidth allowed on
the interface.
• Egress Shaping Rate—Select to enable egress shaping on the interface.
• Committed Information Rate (CIR)—Enter the maximum bandwidth for the
egress interface.
• Committed Burst Size (CBS)—Enter the maximum burst size of data for the
egress interface in bytes of data. This amount can be sent even if it
temporarily increases the bandwidth beyond the allowed limit.
STEP 5 Click Apply. The bandwidth settings are modified, and the switch is updated.
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