F5 LTM Load Balancing Methods: How to Reset Device Trust.

The official F5 SOL13946 provides information on troubleshooting device clustering and configuration sync for 11v  F5 load balancers  and other products, however it is rather long winded.  This guide is designed as a quick reference when troubleshooting device clustering or config sync. An overview of the config sync process for version 9.x and 10.x units can be found in F5 SOL7024

Version 11.x

• Communication between machines occurs in the following manner to form a device cluster:

  mcpd process on the local machine connects to the tmm process on the local machine on port 6699

• tmm process then contacts the peer’s config sync IP on port 4353
• Once the peer receives, they use tmm to contact mcpd over port 6699 on their local device.
• If this process fails, it is re-attempted every 5 seconds.
• If this process succeeds, there is a mesh between peer mcpd processes.

* local machine here refers to the self IP configured for config sync. Check it under Device Management > Devices > click on device > Device Connectivity > Config Sync, for example.

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