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Cisco Bug: CSCvu23227 - MRIB is not inheriting OIF from (*,g) resulting in traffic drops

Last Modified

Oct 12, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

9.3(4)IIL9(0.879)

Description (partial)

Symptom:
After configuring MGVPN on a Nexus switch, the S,G may not inherit the OIF of the *,G entry.

The OIL in the multicast route may look similar to:

`show ip mroute detail vrf all`
(*, 239.40.40.222/32), uptime: 00:44:14, pim ip 
  Incoming interface: Vlan2040, RPF nbr: 10.235.40.252
  Outgoing interface list: (count: 1)
    Ethernet1/51.40, uptime: 00:40:40, pim
  Name is: Oif-list bitfield:
  Maximum Size = 65535  Current Allocated Size = 192
  Bits 00128 - 00001 : 00000000 00000000 00000000 00000000 
  Bits 00256 - 00129 : XXXXXXXX XXXXXXXX 00000000 00002000 

(10.158.40.202/32, 239.40.40.222/32), uptime: 00:40:40, pim mrib ip ngmvpn 
  Incoming interface: Vlan2040, RPF nbr: 10.235.40.251
  Outgoing interface list: (count: 0)  <---- Eth 1/51.40 is missing here

Conditions:
ngMVPN is configured
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