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Some of the network devices connected via MLAG is not reachable if both the MLAG ports are active

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TitleSome of the network devices connected via MLAG is not reachable if both the MLAG ports are active
Symptoms
Devices connected via MLAG ports are not reachable if both the MLAG ports are active.
lets picture SW1 and SW2 are MLAG peers, A device with IP address 1.1.1.1/24 (VLAN 10) is connected to port 1 of each switch and are in same MLAG group. 

Device 1.1.1.1 is reachable only if the port 1 on SW2 is disabled.
Environment
  • EXOS
  • MLAG
  • Summit and BlackDiamond switches
Cause
Mis-configuration.
VLAN 10 is not added to the port 1 of SW2
Resolution
"configure vlan vlan10 add ports 1 tagged or Untagged" 
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