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Cisco Bug: CSCus60275 - mcast duplication: exclude flag not set for snooping grps with vlan flap

Last Modified

Jun 02, 2015

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I1(0.263) 7.0(3)I1(1.137)

Description (partial)

Symptom:
Some receivers see duplicate traffic when the peer_link_exclude_flag is set to FALSE for some groups (for some VLANS) that have a source on a VPC VLAN. Typically, if a group has a source on a VPC VLAN, both routers will be forwarder on VPC VLANS; this will have that VLAN in the OIF. So to avoid duplicates, the MCT link is not added when the SVI is expanded (peer_link_exclude_flag is SET).

Conditions:
The symptoms occur if, in a VPC setup, the user will flap all the MCT VLANS (not the SVIs, but the VLANS).
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