Switch roles

Each VSX switch must be configured with a role – primary or secondary. The roles do not indicate which device is forwarding traffic at a given time as VSX is an active-active forwarding solution. The roles are used to determine which device stays active when there is a VSX split, such as when the ISL goes down, and for determining the direction of configuration-sync. If the VSX ISL goes down, the primary switch keeps forwarding traffic while the secondary switch blocks ports from participating in the VSX LAGs.