F5 BIG-IP - Setting a shared MAC masquerade address

Taken from BIG-IP 9.x Network and System Management Guide: Setting up a Redundant System

Setting a shared MAC masquerade address

For active/standby systems only, you can share the media access control (MAC) masquerade address between BIG-IP units. This feature is useful if you want to use the system in a topology with secure hubs. Sharing the MAC masquerade address between units has the following advantages:

Source:  BIG-IP 9.x Network and System Management Guide: Setting up a Redundant System