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Cisco Bug: CSCvu12601 - N7K proxy-routing multicast Num_replicators >16, Mcast OIL missing in MFDM but present in Mrib.

Last Modified

Oct 16, 2020

Products (8)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(22)

Description (partial)

Symptom:
1. OIL present in MRIB but missing in MFDM

NY-7K# sh ip mroute 239.0.3.103
IP Multicast Routing Table for VRF "default"

(*, 239.0.0.133/32), uptime: 01:02:38, pim ip igmp
Incoming interface: Ethernet1/6, RPF nbr: 10.1.1.1
  Outgoing interface list: (count: 2)     <<<<   OIL count>0,  populated in mrib
    Vlan10, uptime: 00:52:56, igmp
    Vlan20, uptime: 01:02:38, pim
 
(99.99.99.99/32, 239.0.0.133/32), uptime: 00:26:17, ip mrib pim <<< (S,G) created
  Incoming interface: Ethernet1/6, RPF nbr: 10.1.1.1
  Outgoing interface list: (count: 2)
    Vlan804, uptime: 00:26:17, pim     <<<<   OIL count>0,  populated in mrib
    Vlan143, uptime: 00:26:17, mrib     
 
NY-7K# sh forwarding distribution multicast route group 239.0.0.133
 
  (*, 239.0.0.133/32), RPF Interface: Etherne1/6, flags: GP
    Received Packets: 3 Bytes: 2018
    Number of Outgoing Interfaces: 0  <<<  empty OIL in MFDM
    Null Outgoing Interface List           
 
  (99.99.99.99/32, 239.0.0.133/32), RPF Interface: Ethernet1/6, flags: P
    Received Packets: 438002 Bytes: 477817736
    Number of Outgoing Interfaces: 0
    Null Outgoing Interface List         
 
2. MFDM errors:

show system internal mfdm errors
 < snip >
    [102] mfdm_v4_route_entry_add(2169):ERROR: Could not find or allocate OIF list
 < snip>
    [102] mfdm_oiflist_alloc_and_insert(1694):ERROR: Failed to allocate new OIF list data structure


3. Large number (~64k+) of  L3 LTL allocation requests sent to PIXM missing responses from PIXM

show system internal MFDM info statistics:
< snip >
Number of L3 LTL alloc req sent to PIXM            :65xxx
Number of L3 LTL alloc resp from PIXM              :xxxx

Conditions:
mixed mode chassis with proxy-routing enabled and number of proxy layer-3 replicators > 16

show hardware proxy layer-3 detail | in replicators
        Number of proxy layer-3 replicators:   X    <<<<  X > 16
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