Switching and VLANs
Calculated locally
Trunk Allowed VLAN Calculator
Normalize, compare, expand, and compress VLAN allow-lists for trunk consistency checks.
Learn before you deploy
Reference PacketToolbox learning content related to this workflow.
Tool input
Use the fields below and run the calculation or generation locally.
Results
Review output and validation notes before production use.
How it works
Compare two VLAN list expressions to find missing and extra VLANs quickly.
All processing runs in-browser with no external API dependency.
Practical example
Example: 1,10-12,20 compared with 1,10,12,20,40 shows extra VLAN 40.
Related tools
Use these together for complete design and troubleshooting workflows.
- IPv4 Subnet Calculator for subnet boundary and wildcard checks.
- VLSM Planner for hierarchical IPv4 allocation.
- Route Summarization Calculator for clean route advertisement planning.
- Cisco ACL Builder for policy-generation workflows.