Benefits of using RAP cluster support in 8.x


What are the advantages of configuring RAP for cluster support in 8.x?


Without Cluster

•  In earlier codes, RAP needed to be terminated on VRRP-IP or LMS/BKP-LMS needed to be configured for redundancy.
• Clients connected to the RAP will be deauthenticated when the AP fails over to a different controller.
• The above behavior impacts the client traffic.
• In addition to this, RAP needs to download entire configuration on every rebootstrap or failover.


With Cluster

Starting 8.x, RAPs support clustering which will help avoid the above scenarios.

• Classic cluster controller supports redundancy for both APs and clients
• Passive entry will be created on the standby controller when it is L2 connected.
• RAP will form tunnel with all the cluster members using same inner-ip for ease of management.
• Cluster is limited to max 4 nodes in case of RAP.

Client will not be deauthenticated when the RAP fails over and will continue to pass traffic since there was a dormant entry created on the standby controller.




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If we´re placing our RAPs on the internet and they reach central controllers via port forwards from public IPs on an external firewall. Will it be possible to utilize cluster functionality? Do we then specify the public IPs the RAPs need to use somewhere in the cluster configuration?





@Chris - did you ever finalize your RAP setup in 8.1? We're starting our 8.1-based RAP deployment and documentation is skimpy on RAPs in clusters. Thanks!

@vqtran9 Hi!


We´re just about to start the migration and I´ve found out that RAPs that reach the controllers via port forwards (example from the internet via your firewall that does NAT) is not supported with clustering.  This for us means that we´ll have to start out with not using clustering where we have internet based RAPs.


Hopefully they will fix this soon as I think there are many customers using both internal APs and external RAPs to the same redundant controllers that will want to do clustering.



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