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How to configure VLAN speed limiting on a core switch

VLAN speed limiting is achieved by classifying traffic per VLAN and applying traffic policing or rate-limiting policies on the switch interfaces.Overview

VLAN speed limiting allows you to control bandwidth usage for specific VLANs without affecting other VLANs. This is typically done using traffic classifiers, traffic behaviors, and QoS policies applied to interfaces connected to the core switch. You can limit either ingress (incoming) or egress (outgoing) traffic depending on your network design.

Steps for Cisco Switches
  1. Create an Access Control List (ACL) to match VLAN traffic Example for VLAN 80 (10.10.10.0/24) limiting HTTP/HTTPS traffic:

    ip access-list extended ACL_15Mbps permit tcp 10.10.10.0 0.0.0.255 any eq tcp 10.10.10.0 0.0.0.255 any eq 443

  2. Define a class-map to classify the traffic

    class-map Link_15Mbps match access-group ACL_15Mbps

  3. Create a policy-map to police the traffic

    policy-map Policy_15Mbps class Link_15Mbps police 15000000 8000 conform-action transmit exceed-action drop

  4. Apply the policy to the interface

    interface GigabitEthernet1/0 service-policy output Policy_15Mbps This limits outbound traffic to 15 Mbps for VLAN 80 while leaving other VLANs unrestricted (Cisco Community) .

Steps for Huawei Switches
  1. Create VLANs and assign interfaces

    vlan 100vlan 110vlan 120interface GigabitEthernet1/0/1 port link-type trunk port trunk allow-pass vlan 100 110 120

  2. Configure traffic classifiers based on VLAN IDs

    traffic classifier c1 if-match vlan-id 120traffic classifier c2 if-match vlan-id 110traffic classifier c3 if-match vlan-id 100

  3. Define traffic behaviors to limit bandwidth

    traffic behavior b1 car cir 10000

  4. Bind classifiers and behaviors in a traffic policy and apply to interface

    traffic policy p1 classifier c1 behavior b1interface GigabitEthernet1/0/1 traffic-policy p1 inbound This ensures each VLAN receives a specific committed information rate (CIR) while maintaining QoS priorities for voice, video, and data (Huawei Support) .

Best Practices
  • Decide between ingress and egress policing: Egress policing is simpler and avoids packet drops on the core switch. Ingress policing may be needed if upstream traffic needs control.
  • Use QoS priorities: Assign higher priority to latency-sensitive traffic like voice or video.
  • Monitor and adjust: Use show policy-map interface (Cisco) or display traffic policy (Huawei) to verify applied limits.
  • Avoid over-policing: Ensure burst sizes and CIR values are realistic to prevent unnecessary packet drops. By following these steps, you can effectively limit bandwidth per VLAN on a core switch while maintaining normal traffic flow for other VLANs, ensuring fair usage and network stability.
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