Fortinet Document Library

Version:

Version:

Version:

Version:

Version:

Version:


Table of Contents

Devices Managed by FortiOS

MCLAG requirements

  • Both peer switches should be of the same hardware model and same software version. Mismatched configurations might work but are unsupported.
  • There is a maximum of two FortiSwitch models per MCLAG.
  • The routing feature is not available within an MCLAG.
  • When min_bundle or max_bundle is combined with MCLAG, the bundle limit properties are applied only to the local aggregate interface.
  • On the global switch level, mclag-stp-aware must be enabled, and STP must be enabled on all ICL trunks. They are both enabled by default.

NOTE: If you are going to use IGMP snooping with an MCLAG topology:

  • On the global switch level, mclag-igmpsnooping-aware must be enabled. By default, mclag-igmpsnooping-aware is enabled in the FortiSwitchOS CLI.
  • The igmps-flood-traffic and igmps-flood-report settings must be disabled on the ISL and FortiLink trunks; but the igmps-flood-traffic and igmps-flood-report settings must be enabled on ICL trunks. These settings are enabled by default.
  • IGMP proxy must be enabled.

MCLAG requirements

  • Both peer switches should be of the same hardware model and same software version. Mismatched configurations might work but are unsupported.
  • There is a maximum of two FortiSwitch models per MCLAG.
  • The routing feature is not available within an MCLAG.
  • When min_bundle or max_bundle is combined with MCLAG, the bundle limit properties are applied only to the local aggregate interface.
  • On the global switch level, mclag-stp-aware must be enabled, and STP must be enabled on all ICL trunks. They are both enabled by default.

NOTE: If you are going to use IGMP snooping with an MCLAG topology:

  • On the global switch level, mclag-igmpsnooping-aware must be enabled. By default, mclag-igmpsnooping-aware is enabled in the FortiSwitchOS CLI.
  • The igmps-flood-traffic and igmps-flood-report settings must be disabled on the ISL and FortiLink trunks; but the igmps-flood-traffic and igmps-flood-report settings must be enabled on ICL trunks. These settings are enabled by default.
  • IGMP proxy must be enabled.