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MLAG unable to sync when configuration is correct

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Information

 
TitleMLAG unable to sync when configuration is correct
Symptoms
  • MLAG configuration is correct
  • Connection issues through MLAG peers
  • MLAG not in sync
  • In debug fdb show globals:
>  MLAG SyncBlks are seen
>  LclCnt and RmtCnt are never equal
>  LclCkhsum and RmtChksum are never equal
Environment
  • MLAG Peers
  • EXOS
Cause
This issue is seen when the IP-MTU on the ISC VLAN is set above 9198. 
Resolution
Change the IP-MTU on the ISC vlan below 9199.
Additional notes
Command to change IP-MTU:
  • configure ip-mtu 1500 <VLAN>

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