N+1 HA /HA-SKU Wireless Controller Redundancy
The N+1 HA feature builds upon the N+1 redundancy model by allowing a single WLC (Wireless LAN Controller) to be deployed as a backup for multiple primary WLCs. N+1 deployment requires additional AP licenses to be purchased for the backup WLCs which are unused during normal operation.
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Background
Public WLAN has caused mobile workers to become accustomed to being able to access their corporate network from practically anywhere. This paradigm of public access has extended to the enterprise itself and brings a well-founded apprehension over how to secure internal company information and infrastructure assets.
Cisco proposes Unified Wireless Network Solution for Guest Access to provide users with Internet access in a secure manner.
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ASA clustering consists of multiple ASAs acting as a single unit, see Figure 1.
Spanned EtherChannel is the Cisco recommended implementation in which interfaces on multiple members of the cluster are grouped into a single EtherChannel; the EtherChannel performs load balancing between units.
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