In a Cisco Catalyst switch equipped with two supervisor modules an administrator must temporarily remove the active supervisor from the chassis to perform hardware maintenance on it. Which mechanism ensures that the active supervisor removal is not disruptive to the network operation?
Stateful Switchover (SSO) ensures that the active supervisor's removal is not disruptive to the network operation in a Cisco Catalyst switch with two supervisor modules. SSO enables the standby supervisor to take over control without resetting the entire system, maintaining layer 2 state information seamlessly. This mechanism minimizes downtime efficiently in the course of hardware maintenance.
Both C and D could be correct answers. But, gun to my head, I'm going with D. SSO is the fundamental technology that allows this. NSF requires SSO.
Statefull Switch Over is the right answer. SSO
need NSR to be non-disruptive
not if you do it gracefully
What cisco thinks ...i mean asking half Questions with no reference if you want us say SSO you should mention layer 2 And if you want us to say NSR And NSf so mention in the Question meaning what they are trying to doing i dont know ....confusing at exam who ever make this exhibet need to be fired ...
D is correct
So, considering the role of each feature: SSO handles the switchover mechanism. NSF/NSR ensure the forwarding and routing processes continue smoothly during the switchover. If the question asks specifically about the mechanism ensuring the non-disruptive removal of the active supervisor module: D. SSO remains the primary correct answer. If the question considers the broader context of non-disruption during the switchover including forwarding and routing continuity: C. NSF/NSR could be argued as correct too. Given the precise wording of the original question, D. SSO is the best answer.
Correct answer is D The mechanism that ensures the active supervisor removal is not disruptive to the network operation in a Cisco Catalyst switch equipped with two supervisor modules is Stateful Switchover (SSO) https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/XE35-0XO/configuration/guide/config/RPR_XE.pdf
SSO-enabled routers always checkpoint line card operation and Layer 2 protocol states. During a switchover, the standby RP immediately takes control and prevents basic problems such as interface link flaps. However, Layer 3 packet forwarding is disrupted without additional configuration. The RP switchover triggers a routing protocol adjacency flap that clears the route table. When the routing table is cleared, the CEF entries are purged, and traffic is no longer routed until the network topology is relearned and the forwarding table is reprogrammed. Enabling nonstop forwarding (NSF) or nonstop routing (NSR) high availability capabilities informs the router(s) to maintain the CEF entries for a short duration and continue forwarding packets through an RP failure until the control plane recovers. From the official cert guide. Hence, C is correct
SSO .....
SSO since you can you it gracefully and you won't need NSF/NSR for that which are required only when RE fails abruptly
key word is "removal" not fault
Which mechanism ensures that the active supervisor removal is not disruptive to the NETWORK operation? Cisco is about semantics. it specifically asks about the NETWORK operation, which should immediately put your engineer brains thinking routing protocols. SSO is a feature that allows a Standby RP taking over the and prevent some problems, but LAYER 3 disruption is not one of them. In fact, the OCG specifically says that during the switchover, the "routing protocol adjacency" flaps and "clears the route table", this then causes the CEF entries to be purged and at that point "traffic is no longer routed until routes are re-learned" To avoid this situation, NSF/NSR needs to be enabled, this allows the router to "maintain the CEF entries for a short duration and continue forwarding packets through an RP failure until the control plane recovers". The answer is C) NSF/NSR
SSO -> Layer2 In the question not mentioned any L3 service only "Cisco Catalyst switch". I would go with 'D'.
im going with D
both C and D can be correct SSO alone will do the switchover but forwarding will be disturbed for a short period SSO with NSF and NSR activated will do the switchover without affecting the forwarding process
C. NSF/NSR The RP switchover triggers a routing protocol adjacency flap that clears the route table. When the routing table is cleared, the CEF entries are purged, and traffic is no longer routed until the network topology is relearned and the forwarding table is reprogrammed. Enabling nonstop forwarding (NSF) or nonstop routing (NSR) high availability capabilities informs the router(s) to maintain the CEF entries for a short duration and continue forwarding packets through an RP failure until the control plane recovers.
in order to enable NSF/NSR you must enable SSO first. The answer is SSO.
SSO is the right answer
C and D are OK, but the technology which minimizes downtime is NSF.