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Cisco Bug: CSCum66129 - 3850 not forwarding multicast traffic in layer 2 when PIM enabled on SVI

Last Modified

Jan 18, 2020

Products (1)

  • Cisco Catalyst 3650 Series Switches

Known Affected Releases

n/a

Description (partial)

Symptom:
Non Designated PIM router will not forward multicast packets in the same vlan where they are received.

Conditions:
When a 3850 switch is configured with both HSRP and Multicast Routing in a network, one of the switches will be active as Designated Router and the others become non -Designated routers. The HSRP router that becomes a non Designated router will not be flooding the multicast packets in the same Vlan it has received.  This affects the rectangle topologies where the distribution switches are connected to access switches.
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