300-170 · Question #16
You have a VSM that experiences a failure. Which two options are results of the failure? (Choose two )
The correct answer is B. VEM stops working D. Traffic forwarding continues to work without any interruption. This question asks about the consequences of a Virtual Supervisor Module (VSM) failure in a Cisco Nexus 1000V environment.
Question
You have a VSM that experiences a failure. Which two options are results of the failure? (Choose two )
Options
- ACLI access to the virtual switch continues to work without any interruption
- BVEM stops working
- CTraffic forwarding stops for a short period of time and then continues to work normally
- DTraffic forwarding continues to work without any interruption
- EVMware vMotion stops working
How the community answered
(54 responses)- A6% (3)
- B91% (49)
- C2% (1)
- E2% (1)
Why each option
This question asks about the consequences of a Virtual Supervisor Module (VSM) failure in a Cisco Nexus 1000V environment.
CLI access to the virtual switch, which is typically managed via the VSM, would be interrupted or cease to work if the VSM itself has failed.
The Virtual Ethernet Module (VEM) relies on the VSM for initial configuration and ongoing policy updates. While a VSM failure doesn't immediately stop traffic forwarding, it means the VEM will stop receiving new configurations or policy changes, effectively preventing it from being fully managed.
Traffic forwarding does not stop; VEMs are designed to continue forwarding traffic based on their last known configuration from the VSM, avoiding service interruption.
A key design principle of the Cisco Nexus 1000V is that the VEMs continue to forward traffic locally even if the VSM fails. The data plane operation (traffic forwarding) is handled by the VEMs and is not interrupted by a VSM failure, provided the VEMs have their last known good configuration.
While new vMotion operations might be impacted due to the VSM's inability to update network configurations, the most direct and certain impacts of a VSM failure are the cessation of VEM management and the continued traffic forwarding.
Concept tested: Cisco Nexus 1000V VSM failure impact
Source: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-1000v-switch-vmware-vsphere/white_paper_c11-508573.html
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