What is stateful switchover?

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. The primary objective of SSO is to improve the availability of networks constructed with Cisco routers.

What is SSO and NSF?

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 NSF in routing?

Nonstop forwarding (NSF) refers to the capability of the data plane to continue to function hitless when the routing plane disappears (momentarily, that is) and most likely fails over to a standby RP.

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. With NSF/SSO, peer networking devices do not experience routing flaps.

What is Cisco SSO redundancy?

SSO providesRP redundancy by establishing one of the RPs as the active processor and the other RP as the standby processor. SSO also synchronizes critical state information between the RPs so that network state information is dynamically maintained between RPs. SSO is generally used with Cisco nonstop forwarding (NSF).

What is non stop routing?

Page 1. OSPF Nonstop Routing. The OSPF Nonstop Routing feature allows a device with redundant Route Processors (RPs) to maintain its Open Shortest Path First (OSPF) state and adjacencies across planned and unplanned RP switchovers.

What is BGP graceful restart?

Graceful restart is the mechanism by which BGP routing peers avoid a routing flap after a switchover. If the BGP peer has received this capability, it is aware that the device sending the message is NSF-capable. After an RP switchover occurs, the NSF-capable router reestablishes the session with the BGP peer.

What is Eigrp NSF?

EIGRP nonstop forwarding (NSF) capabilities are exchanged by EIGRP peers in hello packets. NSF works with the SSO feature in Cisco software to minimize the amount of time that a network is unavailable to its users following a switchover.

What is Cisco BFD?

BFD is a detection protocol designed to provide fast forwarding path failure detection times for all media types, encapsulations, topologies, and routing protocols. In addition to fast forwarding path failure detection, BFD provides a consistent failure detection method for network administrators.

What is standby RP?

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 feature is enabled by default when the redundancy mode of operation is set to SSO.

What does IP forward protocol nd do?

The ip forward-protocol nd command simply means that the router will forward ND packets for diskless workstations. This is rather obsolete. The ip http commands are for the HTTP server in the router itself. It is a way to configure the router with HTTP, and it means nothing to anything else connected to the router.

What is graceful restart?

Graceful restart allows a routing device undergoing a restart to inform its adjacent neighbors and peers of its condition. During a graceful restart, the restarting device and its neighbors continue forwarding packets without disrupting network performance.

What does it mean to use stateful switchover?

Stateful switchover (SSO) – True Hot Standby Technology. Stateful switchover (SSO) allows for a hot-standby processor to take control of a failed route processor while maintaining connectivity.

What kind of fellowship is the NSF GRFP?

The National Science Foundation Graduate Research Fellowship ( NSF GRFP) is a great way to start a research career. I was a successful applicant in 2010. Below are some details about the program and some tips for applying.

What’s the difference between Juniper NSF and GR?

Juniper users often confuse GRES and GR: Although the “G” in both acronyms stands for “Graceful,” GRES and GR are two different things. And both Cisco and Juniper have internal NSR capabilities, but the circumstances in which each can be used are quite different.

How much money does the NSF GRFP give you?

The NSF GRFP provides $34,000 to the student and some money to your department for three years. You have the flexibility to defer for up to two years in case you have another source of funding (but you cannot defer to take a year off).