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    Check Point

    Check Point ClusterXL deep dive: HA, Load Sharing and sync internals

    TechLeague Editorial··8 min read
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    ClusterXL is the heart of Check Point HA. Knowing how sync, MAC magic and CCP work is the difference between confident upgrades and outages.

    Modes

    • High Availability (active/standby).
    • Load Sharing Multicast or Unicast (active/active).

    Sync

    • Dedicated sync interface; do not share with traffic.
    • Delayed sync allowed for short-lived connections.

    MAC magic

    • Virtual MAC per cluster member ID.
    • Avoid MAC conflicts in stacked clusters.

    Failover

    • pnote and CPHA mechanisms; clusterXL_admin to test.
    • Bond + ClusterXL for max resilience.

    Operations

    • Watch fw ctl pstat for sync drops.
    • cphaprob state during cutovers.

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