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Cisco Bug: CSCun88928 - NGWC blocks DHCP traffic if wireless broadcast disabled

Last Modified

Nov 27, 2020

Products (1)

  • Cisco Wireless Control System

Known Affected Releases

10.1(121.0)

Description (partial) 

Symptom:
Some clients set the BROADCAST flag on the DHCP Discover packet. This requires the DHCP server to reply with a broadcast.
In that case and if you are not using DHCP snooping on the 5760/3850, then the controller will block the return traffic unless you enable "wireless broadcast" which enables broadcast globally (and is thus not always desirable)

Conditions:
Seen on 3.3.2 IOS-XE
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