Which three statements about nonstop active routing (NSR) are correct? (Choose three.)
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A. B. C. D. E.ACD
- NSR uses the graceful Routing Engine switchover infrastructure.
- NSR preservers routing information and protocol sessions on both Routing Engines
- NSR requires that both Routing Engines run the same version of software
NSR and graceful restart cannot be configured or used together
Nonstop active routing (NSR) is a feature that enables uninterrupted routing and forwarding services in a Juniper Networks device, even when a Routing Engine fails. It is achieved through the use of graceful Routing Engine switchover (GRES) infrastructure. Here are the correct statements about NSR:
A. NSR uses the graceful Routing Engine switchover infrastructure NSR uses the GRES infrastructure to switch over from the primary to the backup Routing Engine during a failure. GRES enables the backup Routing Engine to take over forwarding and routing operations in less than a second, ensuring that there is no interruption in network services.
B. NSR and graceful restart work together to reduce downtime during a Routing Engine failure NSR and graceful restart are complementary features that work together to minimize network downtime during a Routing Engine failure. Graceful restart helps to minimize the time it takes for a protocol to recover from a failure by preserving protocol state information during a Routing Engine switchover.
C. NSR preserves routing information and protocol sessions on both Routing Engines NSR preserves routing information and protocol sessions on both the primary and backup Routing Engines. This ensures that when the backup Routing Engine takes over, it has all the necessary information to continue forwarding and routing packets.
D. NSR requires that both Routing Engines run the same version of software NSR requires that both Routing Engines run the same version of software to ensure that there are no conflicts or compatibility issues during a switchover.
E. NSR enables chassisd on both Routing Engines to allow for a smooth transition during a failure NSR enables chassisd, which is the chassis control process, to run on both Routing Engines. This ensures that there is no interruption in the management of the device during a failure, and that the backup Routing Engine can take over management tasks seamlessly.
In summary, NSR is a feature that ensures uninterrupted network services during a Routing Engine failure. It achieves this through the use of GRES infrastructure, which enables a backup Routing Engine to take over forwarding and routing operations seamlessly. NSR works with graceful restart to reduce downtime and preserves routing information and protocol sessions on both Routing Engines. NSR requires that both Routing Engines run the same version of software, and enables chassisd to run on both Routing Engines to allow for a smooth transition during a failure.