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Cisco Bug: CSCuq33844 - WLC does not respond to data channel keep alive

Last Modified

May 15, 2015

Products (1)

  • Cisco 5500 Series Wireless Controllers

Known Affected Releases

7.6(120.0)

Description (partial)

Symptom:
Data channel with other WLC will intermittently flap.

Conditions:
IPv6 enabled on WLC or the WLC has unnecessary vlans allowed on the trunk links to it.

Both of the above can cause unnecessary huge traffic to WLC.

Following message might come up in message logs/syslogs of the affected WLC:-

*ipv6SocketTask: Aug 01 20:17:15.238: #IPV6-3-PKT_SEND_ERR: ipv6_net.c:860 Failed to send packet to SISF Switcher.
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