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Cisco Bug: CSCuq12104 - Mac-flap between vpc LID and FLID with same switch ID on F1

Last Modified

Feb 02, 2017

Products (8)

  • Cisco Nexus 7000 Series Switches
  • 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 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(6)

Description (partial)

Symptom:
%L2FM-4-L2FM_MAC_MOVE: Mac 0001.d7cc.e200 in vlan 254 has moved from 103.11.4514 to 103.11.65535

4514 is the vpc LID and 65535 (0xffff) is the Flood LID

vpc LID can be see in show vpc
show vpc
Legend:
                (*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                     : 56  
vPC+ switch id                    : 103
Peer status                       : peer adjacency formed ok      
vPC keep-alive status             : peer is alive                 
vPC fabricpath status             : peer is reachable through fabricpath
Configuration consistency status  : success 
Per-vlan consistency status       : success                       
Type-2 consistency status         : success 
vPC role                          : primary                       
Number of vPCs configured         : 3   
Track object                      : 10  
Peer Gateway                      : Enabled
Peer gateway excluded VLANs       : -
Dual-active excluded VLANs        : -
Graceful Consistency Check        : Enabled
Auto-recovery status              : Enabled (timeout = 240 seconds)
Fabricpath load balancing         : Disabled

vPC Peer-link status
---------------------------------------------------------------------
id   Port   Status Active vlans    
--   ----   ------ --------------------------------------------------
1    Po1    up     16-17,19-21,23,28,30-41,44-50,64-70,72,74,76,81-92        
                   ,96,112,128,132,165,200-201,224-227,248,254,274,37        
                   4,401,474,700-703,901,951-955,998                         

vPC status
-------------------------------------------------------------------------------
id   Port      Status Consistency Reason           Active vlans  vPC+ Attribute
--   ----      ------ ----------- ------           ------------  --------------

256  Po256     up     success     success          16-17,19-21,2 DF: Yes, FP 
                                                   3,28,30-41,44 MAC:        
                                                   -50,64-70,72, 503.11.4514 
                                                   74,76,81-92,9             
                                                   6,112,128,132         ....

Conditions:
This is only for F1 modules.
This happens for source mac addresses which are incoming on vpc+

When the packet needs to be snooped by the CPU, we use the Flood LID 0xffff.
For eg: packets going to 224.0.0.1, dhcp snooping, etc
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