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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-14209-01
Chapter 12 Configuring WDS, Fast Secure Roaming, Radio Management, and Wireless Intrusion Detection Services
Configuring WLSM Failover
tunnels, which keeps data traffic going between client and SUP. But because of the WLSM failure, the
control traffic going between the access point and the WLSM is disrupted (as shown in Figure 12-18),
which prevents the access points from accepting new client connections until the WLSM software is
back online. Resilient tunnel recovery is automatic and does not require any configuration.
Figure 12-18 Resilient Tunnel Recovery
Active/Standby WLSM Failover
In addition to resilient tunnel recovery, WLSM supports another level of resiliency by allowing you to
deploy two WLSMs per chassis: an active WLSM and a standby WLSM. If the active WLSM fails, the
standby WLSM becomes active and takes over the control traffic for existing and new access point
clients without interrupting data traffic. This feature in addition to resilient tunnel recovery provide
near-hot standby in case of WLSM failure.
Data traffic
Control traffic
Access point
Client
SUP
WLSM
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