Rockwell Automation 1783-WAPxxx Stratix 5100 Wireless Access Point User Manual - Manual (Page 406)

406 Rockwell Automation Publication 1783-UM006A-EN-P - May 2014
Chapter 13 Configuring WDS, Fast Secure Roaming, Radio Management, and Wireless Intrusion Detection Services
Configuring WLSM Failover To ensure near hot standby in cases of WLSM failure, the WLSM Version 2.13
Release supports resilient tunnel recovery and active and standby WLSMs.
Resilient Tunnel Recovery
In the case of a single chassis scenario (one WLSM per chassis), if the WLSM
software fails, existing access point clients connected to the SUP continue to be
connected to the SUP and does not notice any interruption in service.
When an access point detects a WLSM failure, it does not tear down active
tunnels. The active tunnels keep data traffic going between client and SUP.
Because of the WLSM failure, the control traffic going between the access point
and the WLSM is disrupted, (as shown in
Figure 108 on page 406 ). This
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 108 - 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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