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300-610 · Question #169

A network consultant must design a high availability interconnection of a clustered Cisco UCS Fabric Interconnect toward two upstream Layer 2 switches. The Ethernet interconnection must use all redund

The correct answer is D. Cisco UCS Fabric Interconnect in end host mode with dual uplinks distributed evenly to the. To provide high availability and utilize all redundant links while avoiding STP domain impact for a clustered Cisco UCS Fabric Interconnect connected to upstream Layer 2 switches, the Fabric Interconnects must operate in end host mode with dual uplinks distributed evenly.

Data Center Network Design

Question

A network consultant must design a high availability interconnection of a clustered Cisco UCS Fabric Interconnect toward two upstream Layer 2 switches. The Ethernet interconnection must use all redundant links and have no impact on the STP domain size. Which connectivity solution must be used?

Options

  • ACisco UCS Fabric Interconnect in switch mode with dual uplinks distributed evenly to the
  • BCisco UCS Fabric Interconnect in switch mode with a single uplink toward each upstream switch
  • CCisco UCS Fabric Interconnect in end host mode with a single uplink toward each upstream
  • DCisco UCS Fabric Interconnect in end host mode with dual uplinks distributed evenly to the

How the community answered

(45 responses)
  • A
    9% (4)
  • B
    4% (2)
  • C
    2% (1)
  • D
    84% (38)

Why each option

To provide high availability and utilize all redundant links while avoiding STP domain impact for a clustered Cisco UCS Fabric Interconnect connected to upstream Layer 2 switches, the Fabric Interconnects must operate in end host mode with dual uplinks distributed evenly.

ACisco UCS Fabric Interconnect in switch mode with dual uplinks distributed evenly to the

Fabric Interconnects in switch mode participate in STP, which would expand the STP domain, directly contradicting the requirement to have no impact on the STP domain size.

BCisco UCS Fabric Interconnect in switch mode with a single uplink toward each upstream switch

Operating in switch mode impacts the STP domain size, and using a single uplink toward each upstream switch does not fully utilize all redundant links for optimal bandwidth and redundancy.

CCisco UCS Fabric Interconnect in end host mode with a single uplink toward each upstream

While end host mode correctly addresses the STP domain size requirement, using only a single uplink toward each upstream switch does not maximize the utilization of all redundant links for bandwidth and high availability.

DCisco UCS Fabric Interconnect in end host mode with dual uplinks distributed evenly to theCorrect

Cisco UCS Fabric Interconnects in end host mode act as an end station to the upstream switches, preventing them from participating in STP and thus having no impact on the STP domain size. Using dual uplinks to each upstream switch, typically in a port-channel configuration, ensures all redundant links are actively used for both high availability and bandwidth, fulfilling the requirement to utilize all redundant links.

Concept tested: UCS Fabric Interconnect modes, STP avoidance, link utilization

Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/3-1/b_UCSM_GUI_Configuration_Guide_3_1/b_UCSM_GUI_Configuration_Guide_3_1_chapter_01000.html#concept_3C523BBE879F4478B81333F2356B2720

Topics

#Cisco UCS#Fabric Interconnect#end host mode#high availability#STP

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