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Cisco Bug: CSCvt08645 - Cisco 9800: Multicast replicates over CAPWAP with global multicast disabled

Last Modified

Aug 29, 2020

Products (6)

  • Cisco Catalyst 9800 Series Wireless Controllers
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst 9800-L-C Wireless Controller
  • Cisco Catalyst 9800-80 Wireless Controller
  • Cisco Catalyst 9800-L-F Wireless Controller
  • Cisco Catalyst 9800-CL Wireless Controller for Cloud

Known Affected Releases


Description (partial)

On 9800, mdns bridging is enabled by default on wlan. However, until global multicast is disabled, we expect no replication over capwap tunnels. That is not the case on C9800. 

In a sizable deployment, (high AP count),  this has been seen to cause traffic volume to the order of 3:1 egress to ingress, even leading to uplink link getting overhwlemed resulting in connectivity issues/ production impact.

Medium size deployment off 9800 with Apple clients.
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