Hi,
Thank you for posting in Symantec community.
I would be glad to answer your query.
We are adding a new management server into our environment due to growth to help with load balancing. Will this neccesitate a Sylink Drop or Communications Update package or once I add the server to the Management Servers list, will the clients receive the certificate and required information to be able to communicate to that server?
--> No need to use Sylink Drop or Communications Update package. Clients will receive an update from thes SEPM.
Failover and load balancing configurations are supported in Microsoft SQL Server installations only. Failover configurations are used to maintain communication when clients cannot communicate with a Symantec Endpoint Protection Manager. Load balancing is used to distribute client management between management servers. You can configure failover and load balancing by assigning priorities to management servers in Management Server lists.
Simply follow these articles:
See Installing a management server for failover or load balancing.
See Configuring failover and load balancing for Symantec Endpoint Protection Manager.