This issues is a result of bug CSCsg75863. If the user accidently injects a device on the subnet that uses the AP-manager IP address of the controller, the Address Resolution Protocol (ARP) cache on the default gateway router is refreshed with the wrong MAC address. When this occurs, the APs can no longer reach the controller and drop into their discovery phase to look for a controller. The APs send discovery requests, and the controller responds with discovery replies, but the JOIN requests never reach the AP-manager interface of the controller because of the bad ARP entry on the gateway router. After the default 4 hour ARP refresh interval, the APs join the controller if the device is removed.
A workaround for this issue is to configure the static ARP entries on the gateway router of the controller for these IP addresses:
Management IP address—Customers gain access to the graphical user interface (GUI) from another subnet, and the controller receives the AP discovery requests.
AP-Manager IP address—APs join the controller from another subnet.
Every Dynamic interface IP address—Packets from other subnets reach the dynamic interface of the controller.
DHCP packets transmit from the interface of the wireless client. Telnet or SSH to the gateway address of the controller, and use the arp <ip address> <hhhh.hhhh.hhhh> command in order to add the ARP entries. Use the ping command on the default router of the controller to the different addresses in order to refresh the ARP cache on the router. In order to discover the MAC addresses, use this command: show arp | include <ip address>.
We are excited to announce the Second refresh of 17.6.2 EFT/Beta Program for PRODUCTION deployments.
This release is the second qualified EFT/Beta Image and is BU supported.
After previous 17.6.1 CCO, this p...
Listen: https://smarturl.it/CCRS8E33 Follow us: https://twitter.com/ciscochampion The goal for stadium and large venue Wi-Fi is to deliver an exceptional, fast, and reliable wireless experiences to tens of thousands of fan...
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It supports both AireOS and IOS-XE, covering since ...
Thank you for the overwhelming response to the First and Second EFT refresh of 8.10MR6!
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