Which high availability feature allows uninterrupted packet forwarding and temporary suppression of all routing protocol updates?
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A. B. C. D.B
The correct answer to this question is D. Nonstop Active Routing (NSR).
Nonstop Active Routing (NSR) is a high availability feature that enables a network device to continue forwarding packets without interruption while it is undergoing a control plane switchover. This feature is specifically designed to handle situations where a device's control plane is temporarily unavailable due to a software upgrade, a hardware failure, or other similar events.
When NSR is enabled, the active routing engine (RE) maintains a synchronized copy of the forwarding table, as well as the current routing protocol state, on the standby RE. This allows the standby RE to immediately take over the control plane function in case of a switchover, without causing any disruption to packet forwarding.
NSR also allows for temporary suppression of routing protocol updates during the control plane switchover process. This is achieved by keeping a copy of the routing protocol state on the standby RE and using it to update the forwarding table while the active RE is being updated or replaced.
NSR is a critical feature for maintaining high availability in a network, as it enables the network to continue operating even in the face of control plane disruptions. Other high availability features, such as Virtual Router Redundancy Protocol (VRRP), graceful Routing Engine switchover (GRES), and graceful restart (GR), are also important, but they address different aspects of network resilience.