The devices are assigned a MAC hash that's get stored on the WLC. Addresses are issued in a round-robin approach from all the interfaces in the group.
If a client has a static IP configured in, for example, subnet A, and they are allotted subnet B, they will get moved to subnet A (override), before moving to the RUN state, if these conditions are met:
DHCP Required is disabled on the WLAN.
Subnet A is included in the VLAN or the AP group is configured on the WLAN.
The client sends some packet sourced with a static IP in subnet A within the DHCP_REQD interval (~ 2 min default value).
The DHCP_required interval is configurable and can have a maximum value of 120 seconds. Go to Controller > Advanced > DHCP Parameters > DHCP timeout (5-120 seconds).
If the static IP client has an IP address from a subnet that is part of the interface group which is mapped to the WLAN, then the static IP client that joins over that WLAN will move to a RUN state and can pass traffic. Otherwise, the static IP client cannot pass traffic.
http://www.cisco.com/en/US/products/ps10315/products_tech_note09186a0080bb4900.shtml
HTH,
Steve
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Please remember to rate useful posts, and mark questions as answered
HTH,
Steve
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Please remember to rate useful posts, and mark questions as answered
