SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured for stateful switchover (SSO) redundancy mode. When an RP is active and the other RP is standby, SSO enables the standby RP to take over if the active RP fails.
The SSO HSRP feature enables the Cisco IOS HSRP subsystem software to detect that a standby RP is installed and the system is configured in SSO redundancy mode. Further, if the active RP fails, no change occurs to the HSRP group itself and traffic continues to be forwarded through the current active gateway device.
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15-s/fhp-15-s-book/fhp-hsrp-sso.html
This question is worded terrible. Is this accurate for D? "on the same device"? Isn't HSRP between two DIFFERENT devices, one active and the other standby? Failover occurs to the standby RP on a DIFFERENT device and then that device becomes active.
When SSO is enabled on a Cisco router, the active and standby routers exchange state information periodically. In the event of a failure, the standby router assumes the role of the active router and begins forwarding traffic. This process is transparent to the network, and there is no interruption in service.
Specifically, when SSO is enabled with HSRP, the standby router maintains a synchronized copy of the active router's HSRP state information, including the virtual IP address and MAC address. If the active router fails, the standby router can immediately take over as the active HSRP router and continue forwarding traffic using the same virtual IP and MAC addresses.
Therefore, the correct answer is B. It ensures fast failover in the case of link failure.
"SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured for stateful switchover (SSO) redundancy mode. When an RP is active and the other RP is standby, SSO enables the standby RP to take over if the active RP fails."
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15-sy/fhp-15-sy-book/fhp-hsrp-sso.pdf
The answer is D.
D is correct. C is for Cisco Nonstop Forwarding (NSF) with
Stateful Switchover. Note: Do not use HSRP with Cisco Nonstop Forwarding with Stateful Switchover.
D is correct this is a link about SSO HSRP https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15-s/fhp-15-s-book/fhp-hsrp-sso.html
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