A Little knowledge
As you know Exchange server uses SMTP to transfer user and system messages through your Exchange organisation. To keep network traffic low and allow flow control, Exchange uses routing groups. In every group as mentioned there is a master, this master is responsible for updating and holding the link state tables, it also propagates information back to other Exchange servers should you have any.
LSA (Link State Algorithms) are very similar to OSPF (Open Shortest Path First) More on OSPF here
Routers choose and calculate the shortest path to send network messages using OSPF we’ll Exchange uses a similar concept with LSA with a few differences. In Exchange routing groups and connections are called connectors or links. The Link State Algorithm creates a link state table which contains all the information about the routing groups, connectors and more.
Any changes made on your other Exchange servers will be sent across to the routing group master. The routing group master updates it’s LST (Link State Table) and sends the information back out to update all the other Exchange servers.
The LST info is always in RAM and is not written to hard disk. New information will be sent to other routing group masters each time the routing group master restarts etc.
What does LST contain = Information on connectors, servers, routing groups, your organization, address spaces, the link state, costs and the version.