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Fault Tolerance
Limitations
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Fault Tolerance
FlexConnect Fault Tolerance allows wireless access and services to branch clients when:
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FlexConnect Fault Tolerance, along with Local EAP as outlined above and PEAP/EAP-TLS
authentication on FlexConnect AP with release 7.5, together provide zero branch downtime during a
network outage. This feature is enabled by default and cannot be disabled. It requires no configuration
on the controller or AP. However, to ensure Fault Tolerance works smoothly and is applicable, this
criteria should be maintained:
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Summary
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Limitations
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Flex 7500 Wireless Branch Controller Deployment Guide
50
Flex ACL rules should not be configured with permit/deny statement with same subnet as source
and destination.
Traffic on a Centrally Switched WLAN configured for Split Tunneling can be switched locally only
when a wireless client initiates traffic for a host present on the local site. If traffic is initiated by
clients/host on a local site for wireless clients on these configured WLANs, it will not be able to
reach the destination.
Split Tunneling is not supported for Multicast/Broadcast traffic. Multicast/Broadcast traffic will
switch centrally even if it matches the Flex ACL.
FlexConnect Branch APs lose connectivity with the primary Flex 7500 controller.
FlexConnect Branch APs are switching to the secondary Flex 7500 controller.
FlexConnect Branch APs are re-establishing connection to the primary Flex 7500 controller.
WLAN ordering and configurations have to be identical across the primary and backup Flex 7500
controllers.
VLAN mapping has to be identical across the primary and backup Flex 7500 controllers.
Mobility domain name has to be identical across the primary and backup Flex 7500 controllers.
It is recommended to use Flex 7500 as both the primary and backup controllers.
FlexConnect will not disconnect clients when the AP is connecting back to the same controller
provided there is no change in configuration on the controller.
FlexConnect will not disconnect clients when connecting to the backup controller provided there is
no change in configuration and the backup controller is identical to the primary controller.
FlexConnect will not reset its radios on connecting back to the primary controller provided there is
no change in configuration on the controller.
Supported only for FlexConnect with Central/Local Authentication with Local Switching.
Centrally authenticated clients require full re-authentication if the client session timer expires
before the FlexConnect AP switches from Standalone to Connected mode.
Flex 7500 primary and backup controllers must be in the same mobility domain.
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