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Cisco Bug: CSCuj56624 - OIL not programmed in MFDM

Last Modified

Dec 24, 2018

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.2(2a)S11 6.2(2a)S19 6.2(5.49)S0

Description (partial)

Routed multicast traffic gets black-holed on a Nexus 7000.  The Multicast Routing Table (MRIB) has the correct interfaces in the S,G outgoing interface list (OIL), but they are missing from Multicast Forwarding Distribution Manager (MFDM).

Nexus7000# sho ip mroute
IP Multicast Routing Table for VRF "default"

(,, uptime: 1w1d, pim mrib ip
  Incoming interface: port-channel383, RPF nbr:
  Outgoing interface list: (count: 4)
    Vlan100, uptime: 1d11h, mrib
    Vlan101, uptime: 1d11h, mrib
    Vlan102, uptime: 1d11h, mrib
    Vlan400, uptime: 1d11h, mrib, pim

Nexus7000# sho forwarding distribution ip multicast route source | b
  (,, RPF Interface: port-channel383, flags:
    Received Packets: 23430091 Bytes: 22011464043
    Number of Outgoing Interfaces: 1
    Outgoing Interface List Index: 63

This may be seen in a multicast environment after a multicast source feed is stopped then restarted, such as during a server reload.
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