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Information About Stateful Switchover 12 Table 1 Redundancy Modes by Platform and 12.0S and 12.2S Release (continued) Stateful Switchover Redundancy Mode Support in Cisco IOS Software Releases Stateful Switchover Platform Mode 12.0(22)S 12.0(23)S 12.0(24)S 12.2(18)S 12.0(26)S 12.2(20)S 12.0(28)S 12.2(25)S 12.2(33) SRA 7600 HSA No No No No No No No No No RPR No No No No No No No No Yes RPR+ No No No No No No No No Yes SSO No No No No No No No No Yes 10000 HSA No No No No No No No No No RPR No No No No No No No No No RPR+ Yes Yes Yes No Yes No Yes No No SSO Yes Yes Yes No Yes No Yes No No 12000 HSA No No No No No No No No No RPR Yes Yes Yes No Yes No Yes No No RPR+ Yes Yes Yes No Yes No Yes No No SSO Yes Yes Yes No Yes No Yes No No Table 2 Redundancy Modes by Platform and 12.0ST Release Platform Mode 12.0(16)ST 12.0(17)ST 12.0(19)ST 7304 HSA No No No RPR No No No RPR+ No No No SSO — — — 7500 HSA Yes Yes Yes RPR Yes Yes Yes RPR+ No No Yes SSO No No No 10000 HSA No No No RPR No No No RPR+ Yes Yes Yes SSO No No No 12000 HSA No No No RPR Yes Yes Yes RPR+ No Yes Yes SSO No No No
Stateful Switchover Route Processor Synchronization Information About Stateful Switchover In networking devices running SSO, both RPs must be running the same configuration so that the standby RP is always ready to assume control if the active RP fails. To achieve the benefits of SSO, synchronize the configuration information from the active RP to the standby RP at startup and whenever changes to the active RP configuration occur. This synchronization occurs in two separate phases: • While the standby RP is booting, the configuration information is synchronized in bulk from the active RP to the standby RP. • When configuration or state changes occur, an incremental synchronization is conducted from the active RP to the standby RP. Bulk Synchronization During Initialization When a system with SSO is initialized, the active RP performs a chassis discovery (discovery of the number and type of line cards and fabric cards, if available, in the system) and parses the startup configuration file. The active RP then synchronizes this data to the standby RP and instructs the standby RP to complete its initialization. This method ensures that both RPs contain the same configuration information. Note Even though the standby RP is fully initialized, it interacts only with the active RP to receive incremental changes to the configuration files as they occur. Executing CLI commands on the standby RP is not supported. Note On Cisco 12000 series devices with three or more RPs in a chassis, after negotiation of active and standby RP, the non-active (remaining) RPs do not participate in router operation. Synchronization of Startup Configuration Note During system startup on the Cisco 7500 router, Cisco 10000 series Internet router, and Cisco 12000 series devices, the startup configuration file is copied from the active RP to the standby RP. Any existing startup configuration file on the standby RP is overwritten. The startup configuration is a text file stored in the NVRAM of the RP. It is synchronized whenever you perform the following operations: • CLI command copy system:running-config nvram:startup-config is used. • CLI command copy running-config startup-config is used. • CLI command write memory is used. • CLI command copy filename nvram:startup-config is used. • SNMP SET of MIB variable ccCopyEntry in CISCO_CONFIG_COPY MIB is used. • System configuration is saved using the reload command. • System configuration is saved following entry of a forced switchover CLI command. Stateful Switchover 13
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