Quality of Service
General
426 Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
23
VLAN Ingress Rate Limit
Rate limiting per VLAN, performed in the VLAN Ingress Rate Limit page, enables traffic
limiting on VLANs. When VLAN ingress rate limiting is configured, it limits aggregate traffic
from all the ports on the device.
The following constraints apply to rate limiting per VLAN:
• It has lower precedence than any other traffic policing defined in the system. 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.
• It is applied at the device level and within the device at the packet processor level. If
there is more than one packet processor on the device, the configured VLAN rate limit
value is applied to each of the packet processors, independently. Devices with up to 24
ports have a single packet processor, while devices of 48 ports or more have two
packet processors.
Rate limiting is calculated separately for each packet processor in a unit and for each unit in a
stack.
To define the VLAN ingress rate limit:
STEP 1 Click Quality of Service > General > VLAN Ingress Rate Limit.
This page displays the VLAN Ingress Rate Limit Table.
STEP 2 Click Add.
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 Kilobits 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 Running Configuration file is updated.
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