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The redundancy explained in this article is 1:1, which means that one of the units operates in Active state while the other operates in Hot Standby state. High Availability SSO Deployment Guide for Cisco Catalyst 9800 Series Wireless Controllers, Cisco IOS XE Amsterdam 17. The concept of a redundancy management interface adds a number of differences that are covered by the dedicated guide, This document article focuses on HA SSO in versions 16.x.
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In Cisco IOS XE® 17.x and later for the Catalyst 9800. This document describes how to configure Catalyst 9800 Wireless Controllers (WLC - appliance or virtual) in High Availability (HA) SSO without any redundancy management interface in Cisco IOS® XE 16.10 to 16.12.
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