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Dual Homing: AP s with more that one Ethernet port: eg: AP 120’s, can dual home. The AP will use Ethernet port 0 first. If not available then attempt Ethernet port 1 Staggering Switch Connectivity: By staggering your APs, a Cisco switch failure would not cause a totally WIFI blackout in any area. But the number of AP would be reduced. Self Healing: This is an automatic feature . When an AP see no interference from other valid APs it will up its signal. All AP’s strive to be at 100% ARM Co-Channel Interference Mitigation: If enabled an AP can convert itself into an AM if there is too much interference from other valid APs. This was explained in the ARM chapter. If that interference goes down then the AP may reconvert into an AP .
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All AP belong to an AP group as see in previous chapters. In each AP group there is an AP system profile with an attribute LMS-IP. The LMS-IP attribute can be set to a controllers IP. But if this controller failed then the AP would go down as well. By setting up redundancy you can point the LMS-IP to a VRRPs VIP. This way if the active controller was to fail the AP would backup to the standby controller The standby controller may be initially void of any APs or may be the active controller for other APs. All this is done by setting LMS-IP to VRRPs VIP or using and L3 BCK-LMS-IP parameter.
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PIPI or GRE Keepalives would trigger a fail over. GRE keepalives would probably fail first since its timers are smaller). Once an AP has failed keepalives it will reattempt to establish communication with IP address it has in configurations (based on the LMS-IP in the AP Group). Since the VRRP will switch over very fast the AP will be able to re-establish communications with its AP Group on a new controller.
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Never break these rules when setting up redundancy
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1- Does the standby controller have the VLANs that AP group NY1 needs
2- Can the standby Controller handle these new 100 APS on top of any APs that are already on this controller (type of controller) 3- Is the license for the number of APs sufficient to handle another 100APs
4- Does the other controller have licenses that the standby does not have. 5- IF the OS versions are different then the APs will need to upgrade/downgrade and that will cause a minimum of a 5 minute outage (time will vary depending on the number of APs).
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If your APs are separated by routers then a VRRP is not an option. Therefore you can configure the Backup-LMS-IP parameter. Once the AP has attempted the LMS-IP and failed 3 times it will attempt the backup LMS IP. Note: All the rules of redundancy remain. VLANs, Capacity, Licenses, OS
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If there are many controller in one locations then N+1 is possible. One controller could be designated as the backup controller for N other controllers. This will require you to have a VRRP between the backup controller and all other controllers. NOTE: backup-LMS IP could also be used.
Note: All the rules of redundancy remain. VLANs, Capacity, Licenses, OS
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Some customers don’t like the idea of a controller just sitting there waiting for another controller to fail. They decide to split the load between each controller The APs from one AP group would follow VRRP1 and be active on local 1 and the second VRRP2 would be followed by AP groups in Local 2. If either controller would fail, all AP would run on the other controller
Note: All the rules of redundancy remain. VLANs, Capacity, Licenses, OS
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Sometimes you may have full redundancy with VRRP in the main site but a satellite site only has the one controller. In this case the satellite site could set up the backup LMS IP to be the VIP of the main site. Note: All the rules of redundancy remain. VLANs, Capacity, Licenses, OS
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In a data center where many controllers are located it is possible to setup a 3 controller failure and still recover all APs. Note: All the rules of redundancy remain. VLANs, Capacity, Licenses, OS
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The LSM-IP can be set to a controllers IP address or the VRRP VID address
The Backup LMS-IP can be set to the backup Controllers IP address or to the VRRP VID of two backup Controllers
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AP Fast Failover
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This WLAN redundancy solution allows a campus AP to rapidly fail over from an Active to a Standby controller without needing to rebootstrap, which significantly reduces network downtime and client traffic disruption during network upgrades or unexpected failures. APs using the Fast Failover feature regularly communicate with the standby controller, so the standby controller has only a light workload to process if an AP failover occurs. This results in very rapid failover times, and a shorter client reconnect period. Previous redundancy solutions (like a backup-LMS) put a heavy load on the backup controller during failover, resulting in slower failover performance.
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Controllers need to be configured in Master-Local topology to ensure uniformity of config 1:1, 1+1 and N:1 models supported
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N:1 requires 1 standby to be of capacity sufficient to serve APs of N active controllers (for e.g. 4-7210 active, 1-7240 standby) Customers can upgrade from LMS/Backup-LMS or VRRP LMS models to HA
The Fast Failover feature works across Layer-3 networks, so there is no need for a direct Layer-2 connection between controllers in a high-availability group By default, an AP’s Active controller is the controller to which the AP first connects to when it comes up (aruba-master or LMS-IP configuration in the system profile) Other dual mode or standby mode controllers in the same HA group as the Active controller become potential standby controllers for that AP When the AP first connects to its Active controller, that controller sends the AP the IP address of a
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