300-425 · Question #98
An engineer is designing a wireless network to support nigh availability. The network will need to support the total number of APs and client SSO. Live services should continue to work without…
The correct answer is B. controller high availability pair with one of the WLCs having a valid AP count license D. back-to-back direct connection between WLCs. Cisco WLC high availability with client SSO requires a HA pair where only the primary needs an AP count license and the two controllers are connected via a direct back-to-back redundancy port.
Question
An engineer is designing a wireless network to support nigh availability. The network will need to support the total number of APs and client SSO. Live services should continue to work without interruption during the failover. Which two requirements need to be incorporated into the design to meet these needs? (Choose two)
Options
- Aredundant vWLC
- Bcontroller high availability pair with one of the WLCs having a valid AP count license
- C10 sec RTT
- Dback-to-back direct connection between WLCs
- EWLC 7.5 code or more recent
How the community answered
(35 responses)- A9% (3)
- B71% (25)
- C6% (2)
- E14% (5)
Why each option
Cisco WLC high availability with client SSO requires a HA pair where only the primary needs an AP count license and the two controllers are connected via a direct back-to-back redundancy port.
A redundant vWLC alone does not provide client SSO because it lacks the stateful synchronization mechanism that requires the specific HA pair configuration and redundancy port link.
In a Cisco WLC SSO HA pair, only the primary controller requires a valid AP count license; the secondary shadow controller does not need its own separate AP license, which is a specific licensing design requirement.
The supported RTT between HA WLC peers is 80 milliseconds or less; a 10-second RTT far exceeds this threshold and would prevent proper state synchronization between controllers.
A direct physical back-to-back connection between the two WLCs via their dedicated redundancy ports is mandatory for HA SSO; this link carries state synchronization traffic and enables sub-second failover without relying on the production network.
Client SSO support was introduced in WLC software version 7.3, not version 7.5, making 7.5 an incorrect minimum version requirement for this feature.
Concept tested: Cisco WLC HA SSO pair design and licensing requirements
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-6/b_High_Availability_Deployment_Guide.html
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