352-001 Question #728: Real Exam Question with Answer & Explanation

The correct answer is B: Add spine switches. Adding spine switches in a Cisco FabricPath architecture increases the uplink bandwidth available from edge leaf nodes, directly lowering the oversubscription ratio.

Question

A Layer 2 Cisco FabricPath multipoint processor network requires more bandwidth. How can you reduce the oversubscription ratio for the edge ports in the network design?

Options

AAdd leaf switches
BAdd spine switches
CEnable vPC+
DEnable ECMP

Explanation

Adding spine switches in a Cisco FabricPath architecture increases the uplink bandwidth available from edge leaf nodes, directly lowering the oversubscription ratio.

Common mistakes.

A. Adding leaf switches increases the total number of edge ports and their aggregate bandwidth, which raises the numerator of the oversubscription ratio and makes the problem worse rather than better.
C. Enabling vPC+ allows FabricPath edge nodes to present a single logical port channel to dual-homed hosts for redundancy and loop prevention, but it does not add uplink capacity to the spine tier and does not affect the oversubscription ratio.
D. ECMP distributes existing traffic across available equal-cost paths to improve link utilization balance, but it does not provision additional physical bandwidth and therefore cannot change the oversubscription ratio.

Concept tested. FabricPath spine layer scaling to reduce edge oversubscription

Reference. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx-os/fabricpath/configuration/guide/b_FabricPath_Config_Guide_7x.html

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