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:

  1. Click Quality of Service > General > VLAN Ingress Rate Limit (Layer 2). The VLAN Ingress Rate Limit (Layer 2) page opens.
  2. This page displays the VLAN Ingress Rate Limit Table.

  3. Click Add. The Add VLAN Ingress Rate Limit page opens.
  4. 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.
  5. Click Apply. The VLAN rate limit is added, and the Running Configuration file is updated.