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What is SSO mode in Cisco?
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.
What is RPR mode?
• In route processor redundancy (RPR) redundancy mode, the ports on a supervisor engine in standby. mode are disabled. • RPR supports IPv6 multicast traffic.
What is SSO and NSF?
NSF Operation Cisco NSF always runs with SSO and provides redundancy for Layer 3 traffic. NSF works with SSO to minimize the amount of time that a network is unavailable to its users following a switchover. The main purpose of NSF is to continue forwarding IP packets following a supervisor engine switchover.
What is SSO NSF Cisco?
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 Cisco NSR?
NSR is an internal (vendor-specific) mechanism to extend the awareness of routing to the standby routing plane so that in case of failover, the newly active routing plane can take charge of the already established sessions.
How does Cisco NSF work?
Cisco NSF works with the SSO feature. The device supports fault resistance by allowing a standby switch to take over if the active device becomes unavailable. NSF works with SSO to minimize the amount of time a network is unavailable.
What is NSR and NSF?
Graceful Restart (GR) (also known as Non Stop Forwarding (NSF)) and Non Stop Routing (NSR) are two different mechanisms to prevent routing protocol re-convergence during a processor switchover.
What is SSO in Hsrp?
What is VSS mode?
The Cisco Catalyst 6500 Series Virtual Switching System (VSS) allows the clustering of two or more physical chassis together into a single, logical entity. This technology allows for enhancements in all areas of network design, including high availability, scalability, management, and maintenance.
What is stateful switchover SSO?
Stateful Switchover (SSO) is a redundancy feature that allows a Cisco device with two route processors to synchronise router configuration and control plane state information. The processing of mirroring this information between route processors is known as checkpointing.
What is SSO mode in Cisco SSO?
SSO is supported in Cisco IOS Release 12.2 (20)EWA and later releases. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine starts up in a fully-initialized state and synchronizes with the persistent configuration and the running configuration of the active supervisor engine.
What is the purpose of Catalyst 4500 series switches?
… Catalyst 4500 series switches allow a standby supervisor engine to take over if the active supervisor engine fails. In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in route processor redundancy (RPR) or stateful switchover (SSO) operating mode.
What are the Cisco switch requirements for RPR and SSO?
• RPR requires Cisco IOS Release 12.1 (12c)EW, Release 12.1 (19)E or later releases. SSO requires Cisco IOS Release 12.2 (20)EWA or later releases. • The Catalyst 4507R switch and the 4510R switch are the only Catalyst 4500 series switches that support supervisor engine redundancy.
Where can I find the Cisco Catalyst 4500 command reference?
If the command is not found in the Cisco Catalyst 4500 Command Reference, you can locate it in the larger Cisco IOS library. Refer to the Catalyst 4500 Series Switch Cisco IOS Command Reference and related publications at this location: The following prerequisites apply: • Image type of the existing and target image must match.