If a shaman has TotemTimers installed their totem timer buttons will automatically switch to the assigned totems and the Earth Shield timer will switch to its assigned target if configured so. If a shaman does not have TT installed he gets a whisper with his totem configuration and Earth Shield Target. Optionally the totem configuration and Earth Shield targets can be posted to the raid chat or a custom chat channel.
The totem configuration and Earth Shield target for a shaman is stored permanently and does not change or reset if a shaman or the player leaves the raid or the player relogs.