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Cisco Bug: CSCuj45983 - Don't make a client re-DHCP at CoA if not changing VLANs

Last Modified

Oct 02, 2020

Products (1)

  • Cisco 5500 Series Wireless Controllers

Known Affected Releases

7.4(110.0) 8.3(102.0)

Description (partial)

Symptom:
When the WLC gets a CoA (Change of Authorization) RADIUS message (e.g. from ISE), the WLC will send a Deauth to the client, and move the client to DHCP_REQ state.  Unless "DHCP Required" is disabled on the WLAN, this means that the client will then be disconnected, unless it performs a new DHCP request.

With "debug client" in effect on the WLC, this message will be seen:

DHCP_REQD (7) DHCP Policy timeout. Number of DHCP request 0 from client

Conditions:
WLC is using CoA from RADIUS, and has DHCP Required on the WLAN.

Client is one that does not reliably re-DHCP upon 802.11 deauthentication - some Windows 7 and Mac OS X systems have been seen to have this problem.

Related Community Discussions

<key>CSCuj45983</key> - Dont make a client re-DHCP at CoA if not changing VLANs
This also appears to be affecting 8.3.141.0   This should be a much higher priority bug, as touching client devices you don't own is not something you should be doing, and the two VLAN approach goes against best practices.
Latest activity: Jul 10, 2018
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