This RowStatus object represents the existence state of a Level 2 summary address entry, following row status behavior. Administrators use it to add or remove a route-summarization entry that this router originates into Level 2 LSPs, useful for aggregating many specific Level 1 routes into a single backbone advertisement. For example, an engineer sets csIsisL2SummAddrExistState to createAndGo to introduce a new summary address covering an entire newly added subnet range, reducing the number of specific routes flooded into the backbone.