NoteThis section applies to SummitStack only.
The primary node executes the switch‘s management functions, and the backup acts in a standby role. Hitless failover transfers switch management control from the primary to the backup and maintains the state of VRRP. While VRRP supports hitless failover, you do not explicitly configure hitless failover support; rather, if you have two nodes installed, hitless failover is available.
To support hitless failover, the primary node replicates VRRP protocol data units (PDUs) to the backup, which allows the nodes to run VRRP in parallel. Although both nodes receive VRRP PDUs, only the primary transmits VRRP PDUs to neighboring switches and participates in VRRP.
To initiate hitless failover on a network that uses VRRP:
For more detailed information about verifying the status of the nodes and system redundancy, see Understanding System Redundancy. For more information about hitless failover, see Understanding Hitless Failover Support.
NoteFor complete information about software licensing, including how to obtain and upgrade your license and what licenses are appropriate for these features, in the Switch Engine 32.2 Feature License Requirements document.