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Cisco Bug: CSCsy82121 - IGMP Source only not working due to MC_CAP not set

Last Modified

Nov 05, 2018

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

12.2(18)SXF6 12.2(33)SRE1

Description (partial)

Symptoms: Flooding of multicast traffic can be seen on source-only multicast
 Conditions: The symptom is observed on a Cisco Catalyst 6500 series switch that
 is running a SUP720 and with Cisco IOS SXF and SXH Releases.
 When the issue occurs, the <CmdBold>show mac-address multicast<noCmdBold>
 command does not show the group to be installed. It is expected that the
 mrouter ports installed would be seen so that traffic is directed upstream.
 Once an IGMP join is received from a receiver, the group will not be
 source-only and will be installed in the MAC table.
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