Configuring Quality of Service
Configuring QoS
Cisco Small Business 300 Series Managed Switch Administration Guide 257
18
Configuring VLAN Rate Limit
NOTE The VLAN Rate Limit feature is not available when the switch is in Layer 3 mode.
Rate limiting per VLAN, performed in the
VLAN Ingress Rate Limit Page,
enables
traffic limiting on VLANs. QoS rate limiting (configured in the
Policy Table Page
)
has priority over VLAN rate limiting. For example, if a packet is subject to QoS rate
limits but is also subject to VLAN rate limiting, and the rate limits conflict, the QoS
rate limits take precedence.
When VLAN ingress rate limiting is configured, it limits aggregate traffic from all
the ports on the switch.
VLAN Rate Limiting is configured at the device level and rate limits are applied
independently for each device in the network. If there is more than one device in
the system (for example if a network includes 2 Cisco 24-port 10/100 switches
participating in the same VLAN), the configured VLAN rate limit values will be
applied on each of the devices independently.
To define the VLAN ingress rate limit:
STEP 1 Click Quality of Service > General > VLAN Ingress Rate Limit. The
VLAN Ingress
Rate Limit Page
opens.
This page displays the VLAN Ingress Rate Limit Table.
STEP 2 Click Add. The
Add VLAN Ingress Rate Limit Page
opens.
STEP 3 Enter the parameters.
• VLAN ID—Select a VLAN.
• Committed Information Rate (CIR)—Enter the average maximum amount
of data that can be accepted into the VLAN in Kilobytes per second.
• 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. Cannot be
entered for LAGs.
STEP 4 Click Apply. The VLAN rate limit is added, and the switch is updated.
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