Showing posts from August, 2011

Creating Per-site Guest VLANs on a Guest WLC (Cisco Guest Solution)

OverviewBefore the advent of WLC code version, it was difficult to scale a Cisco guest wireless solution (in terms of IP address space) due to the fact that all foreign controllers (i.e. non-guest controllers) could only map to a single layer 3 interface on the guest (anchor) controller.

This often meant that a very large subnet had to be allocated to guest users to allow for multiple sites which shared a guest controller. The guest controller is usually located on a firewall DMZ interface (perhaps in a data center).

The only way around this was to have multiple guest SSIDs (e.g. one per building), with a separate VLAN for each SSID. This is not a very popular option with customers as there is no consistency of SSIDs between sites/buildings.

Another drawback of the single guest-VLAN restriction is that all guest traffic originates from a single subnet range. From an administrative point of view, it is often desirable for guest traffic from different buildings or sites to be …