Here is some information provided by PM and QA regarding a feature called “backward compatibility” for SMA (Symantec Management Agent) and plug-ins:
The use of this feature is intended to be a temporary state to assist customers in migrating the agents in phases. We do not support the long-term use of the product in this state. If a customer encounters an issue that is specific to using an older agent with a new version of the Symantec Managemet Plaftform (SMP) and that issue is not present when the agent is upgraded to the same version as the SMP, we will not fix the issue. The solution will be for the customer to upgrade the agent to the same version as the SMP.
This feature is supported only for the two most recent major/minor versions of the agent. For example, an ITMS 8.1 SMP will enable customers to manage devices using a 7.6 or 8.0 agent. As mentioned, this is intended to be a temporary state to assist customers in migrating their agents because we realize that it is unrealistic for customers to upgrade all agents at once in larger environments. Customers need to understand that they should not plan to run the product in this state for any length of time.
LAC ("Legacy Agent Communication") is irrelevant for SMA >= 7.5 (See DOC9185 "The Legacy Agent Communication (LAC) feature in different versions of IT Management Suite")
Also, running a newer version of the SMA connecting to an older version of the SMP (for example client machines running agent version 8.1 and the SMP is still version 8.0) is not supported. In some instances during the agent (SMA) troubleshooting, it may be suggested to upgrade just few agents to a newer version than the SMP, but this is done to test a specific fix before requesting to upgrade the whole enviroment to that version (for example, upgrading the agent to 8.1 RU7 while the SMP is still on 8.0 RU6 or 8.1 RU6. After checking the agent fix works, you would be requested to upgrade the SMP to 8.1 RU7 in order to be supported running the agents on 8.1 RU7). agent Plug-ins follows the same rules.
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