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How to reduce the need to partition VLANs on core switches

You can reduce VLAN partitioning on core switches by using VLAN pruning, Multiple Spanning Tree (MST) instances, Private VLANs (PVLANs), VRFs, and ACL-based traffic control.VLAN Pruning

VLAN pruning allows you to restrict VLAN traffic to only the switches that need it, reducing unnecessary broadcast traffic and improving network efficiency. By configuring trunk ports to carry only required VLANs, you prevent all VLAN traffic from traversing every link, which reduces congestion and simplifies management. This is particularly effective in large networks where many VLANs exist but not all are needed on every switch .

Multiple Spanning Tree (MST) Instances

MST enables you to group multiple VLANs into a single spanning tree instance, reducing the number of spanning tree calculations and improving convergence times. For example, VLANs 5–10 can be assigned to one MST instance, which decreases the complexity of the network topology and reduces the need for separate VLANs on the core switch .

Private VLANs (PVLANs)

PVLANs allow you to isolate hosts within the same VLAN while still providing access to shared resources like a router or firewall. This reduces the need to create multiple VLANs for security purposes, as compromised hosts can be restricted from communicating with other hosts while still accessing necessary services .

Virtual Routing and Forwarding (VRFs)

VRFs create separate Layer 3 routing domains on the same physical switch, similar to how VLANs segment Layer 2 traffic. By using VRFs, you can maintain logical separation without creating numerous VLANs, and ACLs can be applied between VRFs to control inter-domain traffic .

ACL-Based Traffic Control

Instead of creating multiple VLANs for security, you can apply ACLs on SVIs or VRFs to control which hosts or subnets can communicate. This approach allows you to maintain fewer VLANs while still enforcing strict access policies, reducing the overhead of managing many VLANs .

Best Practices
  • Limit VLANs on trunks: Only allow VLANs that are required on each trunk link.
  • Use VTP pruning: Ensure VLAN information is only propagated to switches that need it.
  • Combine methods: Use MST, PVLANs, and ACLs together to reduce VLAN count while maintaining security and performance.
  • Evaluate network design: Sometimes a topology change or hardware upgrade can reduce the need for excessive VLAN segmentation . By implementing these strategies, you can simplify core switch configuration, reduce broadcast traffic, and maintain security without relying on a large number of VLANs.
How to reduce the need to partition VLANs on core switches

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Only traffic destined for a vlan or more specifically a subnet that is not within the building should be sent to the core

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I have tried using VACLs on the core switch to do this, but the performance was horrible and pretty much made the

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