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Cisco Bug: CSCvt79194 - C9800 clients associated to Wave2 AP having local switching WLAN with native VLAN cannot resolve ARP

Last Modified

Sep 19, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases


Description (partial)

AP blocks ARP Request coming from associated client towards another associated client. Hence, these clients associated to the same AP cannot communicate each other.

Following conditions should meet simultaneously.

- WLC is Catalyst9800 series (-40/-80/-CL)
- IOS-XE version 16.11.1c and 16.12.3 has been confirmed to have this problem. 17.1 or later are not tested at this time.
- AP runs AP-COS. On the other hand, IOS AP such as AP3702 does not see this problem.
- WLAN is local switching
- Flex profile dose not have arp-caching enabled
- Access policy in Policy profile maps VLAN to AP native VLAN (used by CAPWAP).
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