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Zorluk: ZorNetwork Topology Architectures

A network architect is designing a two-tier spine-leaf data center fabric. Each of the 8 leaf switches connects to 48 edge servers using 10 Gbps access ports, generating 480 Gbps480\text{ Gbps} of potential access bandwidth per switch. The design policy mandates a maximum bandwidth oversubscription ratio of 3:13:1 across the spine fabric. If all spine and leaf interconnect interfaces operate at 40 Gbps, which architecture satisfies the oversubscription constraint while adhering to standard Clos topology rules?

  1. Deploy 4 spine switches and connect each leaf switch with a single 40 Gbps link to every spine switch.Cevap
  2. B
    Deploy 2 spine switches and connect each leaf switch with dual 40 Gbps uplinks to every spine switch while trunking the spine switches together.
  3. C
    Deploy 3 spine switches and connect each leaf switch to two designated spine switches to isolate traffic domains.
  4. D
    Deploy 8 spine switches and connect each leaf switch to one dedicated spine switch to eliminate collision domains.

Cevap

Deploying 4 spine switches where each leaf switch has a single 40 Gbps uplink to every spine switch correctly provides 160 Gbps of uplink capacity per leaf (meeting the 3:1 oversubscription ratio) and strictly obeys Spine-Leaf bipartite graph connectivity rules.
Each leaf switch requires 480 Gbps/3=160 Gbps480\text{ Gbps} / 3 = 160\text{ Gbps} of uplink bandwidth to achieve a 3:13:1 oversubscription ratio. Using 40 Gbps links, each leaf switch needs 4 uplinks. Standard Spine-Leaf design rules dictate that every leaf switch must connect to every spine switch, and spine switches must not connect to one another. Therefore, deploying 4 spine switches with 1 link from each leaf to each spine satisfies both bandwidth and topological requirements.

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1
Calculate total access bandwidth per leaf switch
48×10 Gbps=480 Gbps48 \times 10\text{ Gbps} = 480\text{ Gbps} access bandwidth per leaf switch.
Determining total ingress/egress access capacity is required to calculate uplink oversubscription.
2
Calculate required uplink bandwidth based on the 3:1 oversubscription ratio limit
Required Uplink Bandwidth=480 Gbps3=160 Gbps\text{Required Uplink Bandwidth} = \frac{480\text{ Gbps}}{3} = 160\text{ Gbps}.
A 3:13:1 oversubscription ratio means uplink bandwidth must be at least one-third of the access bandwidth.
3
Determine the number of 40 Gbps uplinks required per leaf switch
160 Gbps40 Gbps=4\frac{160\text{ Gbps}}{40\text{ Gbps}} = 4 uplink connections per leaf switch.
Interconnect ports run at 40 Gbps, so 4 ports are required to achieve 160 Gbps total uplink capacity.
4
Apply Clos (Spine-Leaf) architectural connectivity rules
Deploy 4 spine switches and connect each leaf switch to every spine switch using exactly one 40 Gbps uplink.
In a 2-Tier Spine-Leaf topology, every leaf connects to every spine, spines do not connect to spines, and leaves do not connect to leaves.

Anahtar Kavram

Spine-Leaf (Clos) Topology Oversubscription and Fabric Interconnect Rules
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Network Topology Architectures

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