Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 332

Support for RPM Redundancy by Dell Networking OS Version Dell Networking OS supports increasing levels of RPM redundancy (warm and hot) as described in the table below. Table 33. Support for RPM Redundancy by Dell Networking OS Version Platform Failover Type S4820T Hot Failover Failover Behavior Only the failed RPM reboots. All the line cards and SFMs remain online. All application tasks are spawned on the secondary RPM before failover. The running configuration is synchronized at runtime so it does not need to be reapplied during failover. Synchronization between Management and Standby Units Data between the Management and Standby units is synchronized immediately after bootup. After the Management and Standby units have done an initial full synchronization (block sync), Dell Networking OS only updates changed data (incremental sync). The data that is synchronized consists of configuration data, operational data, state and status, and statistics depending on the Dell Networking OS version. Configuring RPM Redundancy To select a primary RPM, use the following command. The RPM in slot 0 is the primary RPM by default. • Manually select the primary RPM. CONFIGURATION mode redundancy primary Example of Viewing RPM Redundancy Configuration Dell#show running-config redundancy ! redundancy auto-failover-limit count 3 period 60 redundancy auto-synchronize full redundancy primary rpm0 Dell# To view which RPM is the primary, use the show running-config redundancy command from EXEC Privilege mode, as shown in the example in the Forcing an RPM Failover. Forcing an Stack Unit Failover To force an Stack unit failover, use the following command. Use this feature when you are replacing a stack unit and when you are performing a warm upgrade. • To trigger a stack unit failover. EXEC Privilege mode redundancy force-failover stack-unit 332 High Availability (HA)