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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

16.12.2s

Description (partial)

Symptom:
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.

Conditions:
Medium size deployment off 9800 with Apple clients.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
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