What is NSF in 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.

Which benefit is realized by implementing Stateful switch over?

Cisco Nonstop Forwarding (NSF) with Stateful Switchover (SSO) provides increased network service availability and protection against unplanned downtime due to hardware or software problems.

What is Cisco stateful switchover?

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 and NSF?

Non-Stop Forwarding (NSF) and Stateful Switchover (SSO) are designed so a dual-Supervisor 6500 (or other device) can minimize packet loss during a Supervisor failure. They do this by keeping L2 and L3 state synchronized between the Supervisors.

What is NSF aware?

IP Routing is NSF aware means that in your switch/router you have non-stop forwarding enabled, which prevents any disruption in traffic even in case of a reload as it segregates the control plane with the data plane.

What is SSO in Cisco?

Cisco Content Hub – Stateful Switchover (SSO)

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.

What is NSF OSPF?

The OSPF Nonstop Forwarding (NSF) Awareness feature allows customer premises equipment (CPE) routers that are NSF-aware to help NSF-capable routers perform nonstop forwarding of packets.

What is non stop 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 NSR and NSF?

Graceful Restart and Non Stop Routing allows for the forwarding of data packets to continue along known routes. By using Graceful Restart routing protocol information is being restored while using Non Stop Routing, routing protocol information is being refreshed. BGP Graceful Restart for NSF.

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 NSR in router?

Nonstop active routing (NSR) uses the same infrastructure as graceful Routing Engine switchover (GRES) to preserve interface and kernel information. However, NSR also saves routing protocol information by running the routing protocol process (rpd) on the backup Routing Engine.

What is NSR BGP?

NSR ensures nonstop services when BGP has redundant processes on multiple MPUs. In contrast to GR, NSR does not require a neighbor device to recover routing information. BGP NSR backs up BGP state and data information from the active BGP process to the standby BGP process.

What is BGP graceful restart?

BGP4 graceful restart (GR) allows for restarts where BGP neighboring devices participate in the restart, helping to ensure that no route and topology changes occur in the network for the duration of the restart.

What is end-of-rib marker?

The End-Of-RIB indicates the end of route updates. The maximum time to wait for the End-of-RIB marker configured on the local end is not advertised to the peer. It controls the time for the local end to receive updates from the peer.

What is BGP hold time?

The Hold Time is a heartbeat mechanism for BGP neighbors to ensure that the neighbor is healthy and alive. When establishing a BGP session, the routers use the smaller Hold Time value contained in the two router’s OPEN messages. The Hold Time value must be at least three seconds, or zero.

What is the difference between hard reset and soft reset in BGP?

While Hard Reset kills the TCP session with BGP neighbor forcing it to restart. This process disrupts the network and considered last resort if soft reset fails.

What causes BGP flapping?

BGP Flapping can occur when you have an unstable peer. This occurs when the BGP route disappears and reappears in the routing table. There is a NetScreen configuration setting that addresses this issue. This is a flap-damping setting, which stalls the advertisement of a route.

What is the use of next hop self in BGP?

The next-hop-self command will allow us to force BGP to use a specified IP address as the next hop rather than letting the protocol choose the nexthop.

How do I remove a neighbor from BGP?

To specify that a community’s attribute should be sent to a BGP neighbor, use the neighbor send-community command in address family or router configuration mode. To remove the entry, use the no form of this command.

What is AS override in BGP?

BGP’s one of the key loop prevention mechanism is to match the AS number in the AS path of the received BGP update. If the BGP AS-path attribute has the AS number of the receiving router in then that BGP route is not installed in the BGP routing table.

What is the difference between internal and external BGP?

BGP supports these session types between neighbors: Internal (iBGP) – Runs between routers in the same autonomous system. External (eBGP) – Runs between routers in different autonomous systems.