Netgear XCM8806 Chassis User Manual - Page 583
step 2, Understanding Hitless Failover Support, Synchronizing Nodes on, Modular Switches
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NETGEAR 8800 User Manual 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. VRRP supports hitless failover. You do not explicitly configure hitless failover support; rather, if you have two nodes installed, hitless failover is available. Note: For more information about protocol, platform, and support for hitless failover, see Understanding Hitless Failover Support on page 69. 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. Note: Before initiating failover, review the section Synchronizing Nodes on Modular Switches on page 825 to confirm that the primary and backup nodes are running software that supports the synchronize command. To initiate hitless failover on a network that uses VRRP: 1. Confirm that the primary and backup nodes are synchronized and have identical software and switch configurations using the show switch {detail} command. The output displays the status of the nodes, with the primary node showing MASTER and the backup node showing BACKUP (InSync). • If the primary and backup nodes are not synchronized and both nodes are running a version of XCM8800 that supports synchronization, proceed to step 2. • If the primary and backup nodes are synchronized, proceed to step 3. 2. If the primary and backup nodes are not synchronized, use the synchronize command to replicate all saved images and configurations from the primary to the backup. After you confirm the primary and backup nodes are synchronized, proceed to step 3. 3. If the primary and backup nodes are synchronized, use the run failover (formerly run msm-failover) command to initiate failover. For more detailed information about verifying the status of the nodes and system redundancy, see Understanding System Redundancy on page 64. For more information about hitless failover, see Understanding Hitless Failover Support on page 69. Chapter 19. VRRP | 583
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