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300-610 · Question #53

Which statement accurately describes the configuration requirements for disjoint Layer 2 networks on Cisco UCS?

The correct answer is D. The Cisco UCS Fabric Interconnect must be in end-host motto.. For Cisco UCS to support disjoint Layer 2 networks, its Fabric Interconnects must be configured in end-host mode.

Network Design

Question

Which statement accurately describes the configuration requirements for disjoint Layer 2 networks on Cisco UCS?

Options

  • AThe Cisco UCS fabric Interconnect must be in switch mode.
  • BThe VLAN IDs must overlap in both Layer 2 domains.
  • CAll of the uplinks most be in one port channel to keep all of the ports active.
  • DThe Cisco UCS Fabric Interconnect must be in end-host motto.

How the community answered

(46 responses)
  • A
    4% (2)
  • B
    2% (1)
  • C
    2% (1)
  • D
    91% (42)

Why each option

For Cisco UCS to support disjoint Layer 2 networks, its Fabric Interconnects must be configured in end-host mode.

AThe Cisco UCS fabric Interconnect must be in switch mode.

Configuring the Cisco UCS Fabric Interconnect in switch mode would typically require a single contiguous Layer 2 domain upstream and is not suitable for disjoint Layer 2 networks due to spanning tree implications.

BThe VLAN IDs must overlap in both Layer 2 domains.

VLAN IDs for disjoint Layer 2 networks should ideally be unique or carefully managed to avoid conflicts, rather than overlapping, as the goal is isolation.

CAll of the uplinks most be in one port channel to keep all of the ports active.

Bundling all uplinks into one port channel would restrict the ability to connect to separate upstream Layer 2 domains, which is a requirement for disjoint networks.

DThe Cisco UCS Fabric Interconnect must be in end-host motto.Correct

Disjoint Layer 2 networks on Cisco UCS are enabled by configuring the Fabric Interconnects in end-host mode. In this mode, the FIs behave like Network Interface Cards (NICs) to the upstream network, preventing loops and allowing isolated Layer 2 domains to terminate on different upstream switches without spanning tree issues.

Concept tested: Cisco UCS end-host mode for disjoint Layer 2

Source: https://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/ucs-manager/whitepaper_c11-580749.html

Topics

#Cisco UCS#disjoint Layer 2 networks#end-host mode#Fabric Interconnect configuration

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