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Cisco Bug: CSCvv31955 - Multicast IP PIM register not sent and data packet got punted to CPU.

Last Modified

Sep 23, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases


Description (partial)

Multicast Data packet came into the device interface properly but drop with following log
2020 Aug 5 18:12:05.277795 mcastfwd [28387]: [28476]: Discarding the packet with src ip x.x.x.x dst ip 239.x.x.x rcvd on ip_msg_l2_iod c Etherneta/b/c vlan m. Mcastfwd not initialized to OTV or ORIB

This log means Multicast packet punt to CPU and Drop. 

Therefore IP Pim register never sent. S,G is not in the MRIB even though RP has the *,g

S,G never built even though the data packet is hitting the L2 interface. IP PIM register is never generated by CPU due to data packet getting dropped inside CPU.

N3K-C3172PQ-10GE as transition switch between L3 PIM and L2 Multicast. Data packet hitting L2 interface. L3 connected to the RP with PIM enabled

No OTV enabled at all
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