What is switchover in Cisco?
The Stateful Switchover (SSO) feature works with Nonstop Forwarding (NSF) in Cisco software to minimize the amount of time a network is unavailable to its users following a switchover. Enables line cards to continue to forward network traffic with no loss of sessions, providing improved network availability.
What is non stop forwarding?
Cisco Nonstop Forwarding (NSF) works with the Stateful Switchover (SSO) feature to minimize the amount of time a network is unavailable to users following a switchover. The main objective of NSF SSO is to continue forwarding IP packets following a Route Processor (RP) switchover.
What is RPR and SSO?
With RPR+ the standby engine remains fully initialized and configured, this shortens the failover time (30-60 seconds) if the active engine fails. With SSO, the backup supervisor engine is completely initialized and layer 2 information is synchronized with the primary engine. Hence Failover takes 2-4 seconds.
What is RPR mode?
RPR supports the following features: • Auto-startup and bootvar synchronization between active and redundant supervisor engines. • Hardware signals that detect and decide the active or redundant status of supervisor engines. • Clock synchronization every 60 seconds from the active to the redundant supervisor engine.
What is switchover in networking?
Switchover is the manual switch from one system to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active server, system, or network, or to perform system maintenance, such as installing patches, and upgrading software or hardware.
What is redundancy force switchover?
Cisco IOS XE Everest 16.5.1a. Usage Guidelines. Use the redundancy force-switchover command to manually switch over to the redundant switch. The redundant switch becomes the new active switch that runs the Cisco IOS image, and the modules are reset to their default settings.
What is Lisp Cisco?
LISP (Location Identifier Separation Protocol) is a routing and addressing architecture developed by Cisco Systems. Each node on the network has one Endpoint Identifier but may have multiple and variable Routing Locators. The protocol provides a mapping service between them.
What is Cisco NSR?
OSPF nonstop routing (NSR) can significantly increase the memory used by OSPF during certain phases of its operation. CPU usage also can be increased. A switchover from the active to the standby RP can take several seconds, depending on the hardware platform, and during this time OSPF is unable to send Hello packets.
What is RPR Qual?
A rapid plasma reagin (RPR) test is a blood test used to screen you for syphilis. It works by detecting the nonspecific antibodies that your body produces while fighting the infection. Syphilis is a sexually transmitted infection (STI) caused by the spirochete bacterium Treponema pallidum.
What is switchover and failover?
A switchover is a role reversal between the primary database and one of its standby databases. A failover is when the primary database (all instances of a RAC primary database) fails and one of the standby databases is transitioned to take over the primary role.
What is switchover anaplan?
When you are using versions, the switchover date is the date at which your actuals become forecasts. For example, if you are looking at a module where time is a dimension, and you have actual sales recorded through March, 2016, your switchover date would be April, 2016.
How does SSO work in a switchover?
Following an initial synchronization between the two supervisor engines, SSO maintains state information between them, including forwarding information. During switchover, system control and routing protocol execution is transferred from the active supervisor engine to the redundant supervisor engine.
What is Cisco SSO and how does it work?
Cisco SSO (frequently used with NSF) minimizes the time a network is unavailable to its users following a switchover while continuing to forward IP packets. The switch is supports route processor redundancy (RPR). For more information, see Chapter8, “Route Processor Redundancy (RPR)” SSO is particularly useful at the network edge.
What happens if SSO fails in a network?
In a failure, SSO switches the system to the hot standby route processor. The failed one will attempt to reboot and operate as the new standby. This handoff happens without rebooting line cards; therefore without creating a link flap, which might cause connectivity protocols to be dropped.
Is enhanced object tracking (EOT) switchover-aware?
Enhanced Object Tracking (EOT) is not stateful switchover-aware and cannot be used with HSRP, Virtual Router Redundancy Protocol (VRRP), or Gateway Load Balancing Protocol (GLBP) in SSO mode. Multicast is not SSO-aware and restarts after switchover; therefore, multicast tables and data structures are cleared upon switchover.