Deploying Technology in the Campus Infrastructure Module
Mapping VLANs in a hierarchical network

When mapping VLANs onto the new hierarchical network design, keep these parameters in mind:

  1. Examine the subnetting scheme that has been applied to the network and associate a VLAN to each subnet.
  2. Configure routing between VLANs at the distribution layer. Routing always occurs at the distribution layer switch.
  3. Make end-user VLANs and subnets local to a specific switch block.
  4. Ideally limit a VLAN to one access switch or switch stack. It however may be necessary to span a VLAN across multiple access switches within a switch block to support say wireless mobility.