Netgear XCM8806 Chassis User Manual - Page 537
STP and Hitless Failover—Modular Switches Only, Understanding Hitless, Failover Support
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NETGEAR 8800 User Manual configure stpd s2 add vlan v2 ports 1:2 disable s1 disable s2 Switch C configure vlan v1 add ports 1:1,2:1 tagged configure vlan v3 add ports 1:3,2:1 tagged configure stpd s1 add vlan v1 ports 1:1 configure stpd s3 add vlan v3 ports 1:3 disable s1 disable s3 STP and Hitless Failover-Modular Switches Only When you install two management modules (MSM/MM) in a NETGEAR 8800 chassis, one node assumes the role of primary and the other node assumes the role of backup. The primary 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 STP. STP supports hitless failover. You do not explicitly configure hitless failover support; rather, if you have two nodes installed, hitless failover is available. Note: Not all platforms support hitless failover in the same software release. For more information about protocol, platform, and MSM/MM support for hitless failover, see Understanding Hitless Failover Support on page 69. To support hitless failover, the primary node replicates STP BPDUs to the backup, which allows the nodes to run STP in parallel. Although both primary and backup node receive STP BPDUs, only the primary transmits STP BPDUs to neighboring switches and participates in STP. Note: Before initiating failover, review the section Synchronizing Nodes on Modular Switches on page 825 to confirm that both primary and backup nodes are running software that supports the synchronize command. To initiate hitless failover on a network that uses STP: 1. Confirm that the nodes are synchronized and have identical software and switch configurations using the show switch {detail} command. The output displays the status of the primary and backup nodes, with the primary node showing MASTER and the backup node showing BACKUP (InSync). Chapter 18. STP | 537
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