When mapping VLANs onto the new hierarchical network design, keep these
parameters in mind:
- Examine the subnetting scheme that has been applied to the network and
associate a VLAN to each subnet.
- Configure routing between VLANs at the distribution layer. Routing always
occurs at the distribution layer switch.
- Make end-user VLANs and subnets local to a specific switch block.
- 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.