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Cisco Bug: CSCun20584 - AP replicates broadcast packets to the default gateway

Last Modified

Feb 16, 2018

Products (1)

  • Cisco Aironet 3700 Series Access Points

Known Affected Releases

7.4(121.0) 7.6(122.21)

Description (partial) 

Symptom:
AP replicates broadcast packets to the default gateway

Conditions:
This is only seen on the scenario of multiple IP subnetworks, on the same vlan that AP is having its BVI

Related Community Discussions

CAPWAP AP forwards broadcast packets from LAN to the gateway.
Ok, the Title may be a little "off", but at a customer I see some strange behavior from APs. When an IP misconfigured wired client on a vlan, where CAPWAP APs are also connected, broadcasts to the ff:ff:ff:ff:ff address, the AP seems to "proxy" or replicate this broadcast, and forward the same broadcast as a "unicast mac" packet to the gateway of the network. This of course causes the gateway to route the packet until it hits the firewall, which of course drops the packet. This gives a lot of log ...
Latest activity: Dec 24, 2014
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