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ClusterXL Load Sharing mode in R80.20 and above Technical Level

ClusterXL Load Sharing mode is available in R80.20 and above, as follows:

Version  Take 
R80.20  Jumbo HF take 117 and above
R80.30 kernel 2.6.18/3.10  Jumbo HF take 76 and above
R80.40 Integrated


  • ClusterXL in Load Sharing mode is not supported with IPSec VPN blade enabled (this limitation does not apply to VSX in VSLS mode)
  • Jumbo Hotfix has to be installed both on Security Gateway and Security Management/Multi-Domain Management server.
  • Starting from R80.20, the ccl_force_sticky kernel parameter must be set to 1 (in fwkern.conf) on all cluster members.
    • Note: The flag is on by default in versions:
      R80.40 since Jumbo Hotfix take 26
      R80.30 since Jumbo Hotfix take 169 
      R80.20 since Jumbo Hotfix 146


How to unblock ClusterXL Load Sharing mode on the Security Management:

Client side (Windows):

  1. Open system properties.
  2. In Advance tab click on "Environment Variables".
  3. Change ENABLE_CLUSTER_LOAD_SHARING_R80_20 variable to 1.
    • Note: Exactly the same variable is used for versions R80.20 and above.
  4. Save changes.
  5. Restart your computer.

Server side (Management):

  1. Edit the file:
    • For Security Management server file location is: $FWDIR/scripts/
    • For Multi-Domain Management server file location is: $MDS_FWDIR/scripts/
  2. Go to the end of the file and find the last line with exec command: "exec $JAVA_HOME/bin/java ..."
  3. Before that line add: export ENABLE_CLUSTER_LOAD_SHARING_R80_20=1
  4. Save the change of the script
  5. Run: cpstop;cpstart

Note: Both the environment variables, on the Windows client and on the Management server must be set.


Known Limitation:

ID Symptom Reported in
PMTR-48976 Multicast Address on a cluster interface (in ClusterXL Load Sharing mode) does not change to the User Defined value after a policy installation. R80.40

Related solution:

sk101539 - ClusterXL Load Sharing mode limitations and important notes 

This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.

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